Homebrew_PCBs

Hi everyone,

I noticed that a few people have mentioned regenerating a cupric chloride etching solution with a few options: aerating it with a fish pump, adding Hydrogen Peroxide, or even using some form of electrolysis.

Has anyone had any long-term success with this process? How long does it take to aerate? Is there any excess waste that needs to be dumped eventually? Are there any circuits I can create to duplicate an electrolysis setup?

I'd greatly appreciate more details on anyone's success or any insights on maintaining a CuCl2 solution for use over and over again. If I can duplicate a setup, or make my own, I'd be happy to write up a tutorial.

Many thanks in advance!

Sincerely,

Poofjunior

Remember that chloride (Cl^-1) is consumed in the etching process. That must be replenished by addition of HCl or something equivalent.

Whether the copper is oxidized to Cu^+2 can be determined by color. I just bubble air until all traces of brown/mud are gone as per Seychell's instructions.

John

----- Original Message -----
From: poofjunior
To: Homebrew_PCBs@yahoogroups.com
Sent: Tuesday, May 08, 2012 9:39 AM
Subject: [Homebrew_PCBs] Long-Term CuCl2 setup



Hi everyone,

I noticed that a few people have mentioned regenerating a cupric chloride etching solution with a few options: aerating it with a fish pump, adding Hydrogen Peroxide, or even using some form of electrolysis.

Has anyone had any long-term success with this process? How long does it take to aerate? Is there any excess waste that needs to be dumped eventually? Are there any circuits I can create to duplicate an electrolysis setup?

I'd greatly appreciate more details on anyone's success or any insights on maintaining a CuCl2 solution for use over and over again. If I can duplicate a setup, or make my own, I'd be happy to write up a tutorial.

Many thanks in advance!

Sincerely,

Poofjunior





[Non-text portions of this message have been removed]

On 08/05/12 23:39, poofjunior wrote:

> Hi everyone,
>
> I noticed that a few people have mentioned regenerating a cupric chloride
> etching solution with a few options: aerating it with a fish pump, adding
> Hydrogen Peroxide, or even using some form of electrolysis.
>
> Has anyone had any long-term success with this process? How long does it
> take to aerate? Is there any excess waste that needs to be dumped
> eventually?

No.

> Are there any circuits I can create to duplicate an electrolysis setup?
>
> I'd greatly appreciate more details on anyone's success or any insights on
> maintaining a CuCl2 solution for use over and over again. If I can duplicate
> a setup, or make my own, I'd be happy to write up a tutorial.

Ferric chloride is commonly known as Profloc-F for floculating in sewer treatment.

You shouldn't dispose of ferric chloride if using air agitation such as
bubbling, because it'll eventually turn green and work as copper-chloride etcher
and last forever (the oxygenation is needed iirc). My etchant is years old and
still working well.

I use a bubble etcher same as the first in this list:

http://www.esr.co.uk/electronics/pcb-tanks.htm

The only aeration that's needed happens during etching anyway.

That one comes with a heater, but i get a complete etch of double-side pcb at
room temperature in ~12mins.

Just keep the stuff topped up with hydrochloric acid every few months and it'll
work well instead of the water evaporating out. Keep a cover over the container
when not in use.

When starting with new ferric chloride, first dilute it 1:1 with water, then put
a bit (like half a cup per litre) of hydrochloric acid in it.

Copper saturated etchant is excellent weed killer. Apply only selectively, or
you'll end up with a large black spot on the lawn.

"poofjunior" <seeifyoucanmeetme@...> writes:

> Has anyone had any long-term success with this process? How long does
> it take to aerate? Is there any excess waste that needs to be dumped
> eventually?

I put together my CuCl etchant around March 2008, so four years ago.
I'm still using it. I run the air pump only when I'm actively using it
(i.e. from "plug in the heater" to "done"), and it's been jade green the
whole time. I occasionally test the HCl levels and add acid, and/or let
some of the water evaporate, but otherwise I just use it to etch.

> Are there any circuits I can create to duplicate an electrolysis
> setup?

There's no electricity involved in my tank at all, aside from the heater
and air pump.

> Whether the copper is oxidized to Cu^+2 can be determined
> by color. I just bubble air until all traces of brown/mud
> are gone as per Seychell's instructions.

He had a great web page describing the process but it seems to be down. Does anyone have an archived copy of the page?

http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html

It covered how to determine optimum pH, specific gravity, temperature, etc and was probably the most thorough coverage I have seen given to the topic.

Aaron

I just added a text and MHT version to our files section: Seychell_Cupric Chloride

John

----- Original Message -----
From: Aaron
To: Homebrew_PCBs@yahoogroups.com
Sent: Tuesday, May 08, 2012 3:25 PM
Subject: [Homebrew_PCBs] Re: Long-Term CuCl2 setup



> Whether the copper is oxidized to Cu^+2 can be determined
> by color. I just bubble air until all traces of brown/mud
> are gone as per Seychell's instructions.

He had a great web page describing the process but it seems to be down. Does anyone have an archived copy of the page?

http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html

It covered how to determine optimum pH, specific gravity, temperature, etc and was probably the most thorough coverage I have seen given to the topic.

Aaron





[Non-text portions of this message have been removed]

John, thanks for posting that. It has a lot of good info.

I have been wanting to try a CuCl2 setup but had to wait for summer, when classes are over.

Aaron

--- In Homebrew_PCBs@yahoogroups.com, "John Anhalt" <janhalt@...> wrote:
>
> I just added a text and MHT version to our files section: Seychell_Cupric Chloride
>
> John
>
>
> ----- Original Message -----
> From: Aaron
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Tuesday, May 08, 2012 3:25 PM
> Subject: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
>
>
>
> > Whether the copper is oxidized to Cu^+2 can be determined
> > by color. I just bubble air until all traces of brown/mud
> > are gone as per Seychell's instructions.
>
> He had a great web page describing the process but it seems to be down. Does anyone have an archived copy of the page?
>
> http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html
>
> It covered how to determine optimum pH, specific gravity, temperature, etc and was probably the most thorough coverage I have seen given to the topic.
>
> Aaron
>
>
>
>
>
> [Non-text portions of this message have been removed]
>

The Wayback Machine has one: http://web.archive.org/web/20100206170229/http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html

--- On Tue, 5/8/12, Aaron <ataylor@...> wrote:

From: Aaron <ataylor@...>
Subject: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
To: Homebrew_PCBs@yahoogroups.com
Date: Tuesday, May 8, 2012, 3:25 PM


























> Whether the copper is oxidized to Cu^+2 can be determined

> by color. I just bubble air until all traces of brown/mud

> are gone as per Seychell's instructions.



He had a great web page describing the process but it seems to be down. Does anyone have an archived copy of the page?



http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html



It covered how to determine optimum pH, specific gravity, temperature, etc and was probably the most thorough coverage I have seen given to the topic.



Aaron



























[Non-text portions of this message have been removed]

On Tue, 8 May 2012 16:34:41 -0700 (PDT), you wrote:

>The Wayback Machine has one: http://web.archive.org/web/20100206170229/http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html
>

Why can't someone just put a copy of this information (with proper credit) into the files
section since the original page is no longer active?

Keith Bowers WB4LSJ- Thomasville, NC

Hello, I found a PDF document here:
http://www.goldrecovery.us/goldrecovery/documents/CuCl.pdf

--- In Homebrew_PCBs@yahoogroups.com, kabowers@... wrote:
>
> On Tue, 8 May 2012 16:34:41 -0700 (PDT), you wrote:
>
> >The Wayback Machine has one: http://web.archive.org/web/20100206170229/http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html
> >
> Why can't someone just put a copy of this information (with proper credit) into the files
> section since the original page is no longer active?
>
> Keith Bowers WB4LSJ- Thomasville, NC
>

YES! That's the real deal, complete with his pictures.

Donald.
--
*Plain Text* email -- it's an accessibility issue
() no proprietary attachments; no html mail
/\ ascii ribbon campaign - <www.asciiribbon.org>

----- Original Message -----
> From: "epareja2" <epareja2@...>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Wednesday, May 9, 2012 10:17:08 AM
> Subject: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
> Hello, I found a PDF document here:
> http://www.goldrecovery.us/goldrecovery/documents/CuCl.pdf
>
>
> --- In Homebrew_PCBs@yahoogroups.com, kabowers@... wrote:
> >
> > On Tue, 8 May 2012 16:34:41 -0700 (PDT), you wrote:
> >
> > >The Wayback Machine has one:
> > >http://web.archive.org/web/20100206170229/http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html
> > >
> > Why can't someone just put a copy of this information (with proper
> > credit) into the files
> > section since the original page is no longer active?
> >
> > Keith Bowers WB4LSJ- Thomasville, NC
> >
>
>
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and
> Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>

Thanks, everyone,

I've added a "Long Term Cupric Chloride Setup" folder to the files section for storing a few insights I've found.

Cheers!


Poofjunior

Hi John,

Thanks for the files! Wayback Machine had a number of captures, but some of the images and charts are missing. I couldn't find any other sources for this article.

Jimmie





________________________________
From: John Anhalt <janhalt@...>
To: Homebrew_PCBs@yahoogroups.com
Sent: Tuesday, May 8, 2012 4:07 PM
Subject: Re: [Homebrew_PCBs] Re: Long-Term CuCl2 setup



I just added a text and MHT version to our files section: Seychell_Cupric Chloride

John

----- Original Message -----
From: Aaron
To: Homebrew_PCBs@yahoogroups.com
Sent: Tuesday, May 08, 2012 3:25 PM
Subject: [Homebrew_PCBs] Re: Long-Term CuCl2 setup




[Non-text portions of this message have been removed]

There is already an Acid Etching folder, I put the PDF file in there.

http://tech.groups.yahoo.com/group/Homebrew_PCBs/files/Acid_Etching/

The problem with listing folders by someone's name, is what if someone doesn't know who Adam Seychell is but is looking for information on acid etchant?

Steve Greenfield AE7HD

--- In Homebrew_PCBs@yahoogroups.com, James Irving <k9jfk@...> wrote:
>
> Hi John,
>
> Thanks for the files! Wayback Machine had a number of captures, but some of the images and charts are missing. I couldn't find any other sources for this article.
>
> Jimmie
>
>
>
>
>
> ________________________________
> From: John Anhalt <janhalt@...>
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Tuesday, May 8, 2012 4:07 PM
> Subject: Re: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
>
>
> Â
> I just added a text and MHT version to our files section: Seychell_Cupric Chloride
>
> John
>
> ----- Original Message -----
> From: Aaron
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Tuesday, May 08, 2012 3:25 PM
> Subject: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
>
>
>
>
> [Non-text portions of this message have been removed]
>

Are there any etchants used by hobbyists that are not acid?

Why not just have an "etchants" folder for everything?

John

----- Original Message -----
From: AlienRelics
To: Homebrew_PCBs@yahoogroups.com
Sent: Wednesday, May 09, 2012 8:34 PM
Subject: [Homebrew_PCBs] Re: Long-Term CuCl2 setup



There is already an Acid Etching folder, I put the PDF file in there.

http://tech.groups.yahoo.com/group/Homebrew_PCBs/files/Acid_Etching/

The problem with listing folders by someone's name, is what if someone doesn't know who Adam Seychell is but is looking for information on acid etchant?

Steve Greenfield AE7HD

--- In Homebrew_PCBs@yahoogroups.com, James Irving <k9jfk@...> wrote:
>
> Hi John,
>
> Thanks for the files! Wayback Machine had a number of captures, but some of the images and charts are missing. I couldn't find any other sources for this article.
>
> Jimmie
>
>
>
>
>
> ________________________________
> From: John Anhalt <janhalt@...>
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Tuesday, May 8, 2012 4:07 PM
> Subject: Re: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
>
>
> Â
> I just added a text and MHT version to our files section: Seychell_Cupric Chloride
>
> John
>
> ----- Original Message -----
> From: Aaron
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Tuesday, May 08, 2012 3:25 PM
> Subject: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
>
>
>
>
> [Non-text portions of this message have been removed]
>





[Non-text portions of this message have been removed]

Are there alkaline etchants?

Sure, I can change the name to just Etchants.

I've moved the other files/folders I've found about etchants into that folder. So if you've recently created a folder about etchants and can't find it, look in there.

I'm changing it to "Etchants" now.

Steve Greenfield AE7HD

--- In Homebrew_PCBs@yahoogroups.com, "John Anhalt" <janhalt@...> wrote:
>
> Are there any etchants used by hobbyists that are not acid?
>
> Why not just have an "etchants" folder for everything?
>
> John
>
>
> ----- Original Message -----
> From: AlienRelics
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Wednesday, May 09, 2012 8:34 PM
> Subject: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
>
>
>
> There is already an Acid Etching folder, I put the PDF file in there.
>
> http://tech.groups.yahoo.com/group/Homebrew_PCBs/files/Acid_Etching/
>
> The problem with listing folders by someone's name, is what if someone doesn't know who Adam Seychell is but is looking for information on acid etchant?
>
> Steve Greenfield AE7HD
>

On 10/05/2012 10:44, John Anhalt wrote:

>
> Are there any etchants used by hobbyists that are not acid?
>
> Why not just have an "etchants" folder for everything?
>
> John
>

Copper (II) Ammonia chloride/sulfate etchants are alkaline but really
need a automatic replenishing system to keep them working well. They
also inherently release ammonia so not practical for just the occasional
use. There have been attempts to run the ammonia concentration very low
so it doesn't smell, but solution turns to sludge (copper chloride
precipitation) at the drop of a hat.
Air regenerated acid copper chloride is still my favorite. :)
Its only disadvantage is its etches about 1/2 speed of fresh strong
solution of ferric chloride in the same conditions.


[Non-text portions of this message have been removed]

Re: alkaline etchants

Yes, there is an etchant that is considered alkaline. It apparently is used commercially and is discussed here:

http://www.dtsc.ca.gov/PollutionPrevention/sb14/upload/sr-technologies-printed-circuit-board-manufacture.pdf

http://www.chemcut.net/downloads/Chemcut%20Thoughts%20on%20Undercut_Doc.pdf

John

----- Original Message -----
From: AlienRelics
To: Homebrew_PCBs@yahoogroups.com
Sent: Wednesday, May 09, 2012 8:47 PM
Subject: [Homebrew_PCBs] Re: Long-Term CuCl2 setup



Are there alkaline etchants?

Sure, I can change the name to just Etchants.

I've moved the other files/folders I've found about etchants into that folder. So if you've recently created a folder about etchants and can't find it, look in there.

I'm changing it to "Etchants" now.

Steve Greenfield AE7HD

--- In Homebrew_PCBs@yahoogroups.com, "John Anhalt" <janhalt@...> wrote:
>
> Are there any etchants used by hobbyists that are not acid?
>
> Why not just have an "etchants" folder for everything?
>
> John
>
>
> ----- Original Message -----
> From: AlienRelics
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Wednesday, May 09, 2012 8:34 PM
> Subject: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
>
>
>
> There is already an Acid Etching folder, I put the PDF file in there.
>
> http://tech.groups.yahoo.com/group/Homebrew_PCBs/files/Acid_Etching/
>
> The problem with listing folders by someone's name, is what if someone doesn't know who Adam Seychell is but is looking for information on acid etchant?
>
> Steve Greenfield AE7HD
>





[Non-text portions of this message have been removed]

That is the reason I qualified my comment. Also responded with some links.

John

----- Original Message -----
From: Adam Seychell
To: Homebrew_PCBs@yahoogroups.com
Sent: Thursday, May 10, 2012 2:46 AM
Subject: Re: [Homebrew_PCBs] Re: Long-Term CuCl2 setup



On 10/05/2012 10:44, John Anhalt wrote:
>
> Are there any etchants used by hobbyists that are not acid?
>
> Why not just have an "etchants" folder for everything?
>
> John
>
Copper (II) Ammonia chloride/sulfate etchants are alkaline but really
need a automatic replenishing system to keep them working well. They
also inherently release ammonia so not practical for just the occasional
use. There have been attempts to run the ammonia concentration very low
so it doesn't smell, but solution turns to sludge (copper chloride
precipitation) at the drop of a hat.
Air regenerated acid copper chloride is still my favorite. :)
Its only disadvantage is its etches about 1/2 speed of fresh strong
solution of ferric chloride in the same conditions.

[Non-text portions of this message have been removed]





[Non-text portions of this message have been removed]

Hey, Adam.

Is it OK to save and distribute to friends copies of your [excellent] write-up of CuCl2 etchant chemistry?

Many thanks,
Donald.
--
*Plain Text* email -- it's an accessibility issue
() no proprietary attachments; no html mail
/\ ascii ribbon campaign - <www.asciiribbon.org>

----- Original Message -----
> From: "Adam Seychell" <a_seychell@...>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Thursday, May 10, 2012 2:46:46 AM
> Subject: Re: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
> On 10/05/2012 10:44, John Anhalt wrote:
> >
> > Are there any etchants used by hobbyists that are not acid?
> >
> > Why not just have an "etchants" folder for everything?
> >
> > John
> >
> Copper (II) Ammonia chloride/sulfate etchants are alkaline but really
> need a automatic replenishing system to keep them working well. They
> also inherently release ammonia so not practical for just the
> occasional
> use. There have been attempts to run the ammonia concentration very
> low
> so it doesn't smell, but solution turns to sludge (copper chloride
> precipitation) at the drop of a hat.
> Air regenerated acid copper chloride is still my favorite. :)
> Its only disadvantage is its etches about 1/2 speed of fresh strong
> solution of ferric chloride in the same conditions.
>
>
> [Non-text portions of this message have been removed]
>

On 11/05/2012 10:12, Donald H Locker wrote:

>
> Hey, Adam.
>
> Is it OK to save and distribute to friends copies of your [excellent]
> write-up of CuCl2 etchant chemistry?
>
> Many thanks,
> Donald.
>

Yes sure. I'm note sure what happened to the original web site. Someone
converted to PDF and made it available at:
http://www.goldrecovery.us/goldrecovery/documents/CuCl.pdf
In a week I'll be using a new ISP, so I'll upload it again.

This document I wrote back in 2005, was only a first draft and I
planned to one day make it more complete with better illustrations.
It'll have to wait one day when I get my lab set up again.


[Non-text portions of this message have been removed]

Thank you, Adam.

I downloaded your original file back in 2007 or 2008 and printed it for my library, but have wondered since why it disappeared. I find it hard to believe it was a "first draft" - it has proven to be an excellent reference. Good to know you're still around.

Donald.
--
*Plain Text* email -- it's an accessibility issue
() no proprietary attachments; no html mail
/\ ascii ribbon campaign - <www.asciiribbon.org>

----- Original Message -----
> From: "Adam Seychell" <a_seychell@...>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Friday, May 11, 2012 7:22:27 AM
> Subject: Re: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
> On 11/05/2012 10:12, Donald H Locker wrote:
> >
> > Hey, Adam.
> >
> > Is it OK to save and distribute to friends copies of your
> > [excellent]
> > write-up of CuCl2 etchant chemistry?
> >
> > Many thanks,
> > Donald.
> >
> Yes sure. I'm note sure what happened to the original web site.
> Someone
> converted to PDF and made it available at:
> http://www.goldrecovery.us/goldrecovery/documents/CuCl.pdf
> In a week I'll be using a new ISP, so I'll upload it again.
>
> This document I wrote back in 2005, was only a first draft and I
> planned to one day make it more complete with better illustrations.
> It'll have to wait one day when I get my lab set up again.
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and
> Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>

On 5/8/2012 1:25 PM, Aaron wrote:

>
> > Whether the copper is oxidized to Cu^+2 can be determined
> > by color. I just bubble air until all traces of brown/mud
> > are gone as per Seychell's instructions.
>
> He had a great web page describing the process but it seems to be
> down. Does anyone have an archived copy of the page?
>
> http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html
> <http://members.optusnet.com.au/%7Eeseychell/PCB/etching_CuCl/index.html>
>
> It covered how to determine optimum pH, specific gravity, temperature,
> etc and was probably the most thorough coverage I have seen given to
> the topic.
>
> Aaron
>
>

The page can be found at
http://web.archive.org/web/20100206170229/http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html
Some of the pictures are missing but all of the content is there.



[Non-text portions of this message have been removed]

I have an archived copy of the Seychell paper (with pictures) in the cupric
chloride section of my project notes here:
http://jimlaurwilliams.org/wordpress/?cat=22. There are still some links
in the paper that don't work, though.

Jim


[Non-text portions of this message have been removed]

On Thu, 9 Aug 2012 00:07:33 -0500, you wrote:

>I have an archived copy of the Seychell paper (with pictures) in the cupric
>chloride section of my project notes here:
>http://jimlaurwilliams.org/wordpress/?cat=22. There are still some links
>in the paper that don't work, though.
>
>Jim
>
>

Great page Jim, thanks for the info.

FWIW - I recently went looking for 40 Volume peroxide in my area
and found that Sally Beauty Supply stores stock it. It also seems their
stores show up in the same building cluster as WalMart stores.

Keith Bowers WB4LSJ- Thomasville, NC

Steve put a copy in our files <http://tech.groups.yahoo.com/group/Homebrew_PCBs/files/Etchants/CuCl.pdf> last May. Most convenient.

I found Sally Beauty next to a Target, locally, so you can avoid the WalMart offshore-production world. (Always the low cost; always the low value.) Check your local hair salons, too. When I explained what I was using it for, the people were delighted that one of their lowly products was useful for high-tech electronics development!

Donald.
--
*Plain Text* email -- it's an accessibility issue
() no proprietary attachments; no html mail
/\ ascii ribbon campaign - <www.asciiribbon.org>

----- Original Message -----
> From: kabowers@...
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Thursday, August 9, 2012 10:14:20 AM
> Subject: Re: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
> On Thu, 9 Aug 2012 00:07:33 -0500, you wrote:
>
> >I have an archived copy of the Seychell paper (with pictures) in the cupric
> >chloride section of my project notes here:
> >http://jimlaurwilliams.org/wordpress/?cat=22. There are still some links
> >in the paper that don't work, though.
> >
> >Jim
> >
> >
> Great page Jim, thanks for the info.
>
> FWIW - I recently went looking for 40 Volume peroxide in my area
> and found that Sally Beauty Supply stores stock it. It also seems their
> stores show up in the same building cluster as WalMart stores.
>
> Keith Bowers WB4LSJ- Thomasville, NC
>

I have been using Baquacil (that I buy at swimming
pool supply stores) as my source of Hydrogen Peroxide.
I do not remember the % but close 30% best I remember.
Just JFYI.
Works great for me.
Derward Myrick KD5WWI



Steve put a copy in our files <http://tech.groups.yahoo.com/group/Homebrew_PCBs/files/Etchants/CuCl.pdf> last May. Most convenient.

I found Sally Beauty next to a Target, locally, so you can avoid the WalMart offshore-production world. (Always the low cost; always the low value.) Check your local hair salons, too. When I explained what I was using it for, the people were delighted that one of their lowly products was useful for high-tech electronics development!

Donald.
--
*Plain Text* email -- it's an accessibility issue
() no proprietary attachments; no html mail
/\ ascii ribbon campaign - <www.asciiribbon.org>

----- Original Message -----
> From: kabowers@...
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Thursday, August 9, 2012 10:14:20 AM
> Subject: Re: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
> On Thu, 9 Aug 2012 00:07:33 -0500, you wrote:
>
> >I have an archived copy of the Seychell paper (with pictures) in the cupric
> >chloride section of my project notes here:
> >http://jimlaurwilliams.org/wordpress/?cat=22. There are still some links
> >in the paper that don't work, though.
> >
> >Jim
> >
> >
> Great page Jim, thanks for the info.
>
> FWIW - I recently went looking for 40 Volume peroxide in my area
> and found that Sally Beauty Supply stores stock it. It also seems their
> stores show up in the same building cluster as WalMart stores.
>
> Keith Bowers WB4LSJ- Thomasville, NC
>




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