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Subject: Re: [Homebrew_PCBs] My materials for "Cold Process?"

From: Kirk Kleinschmidt <kirk@...>
Date: 2016-01-20

Thanks for the heads-up. My etching will be done in an open-doored garage. At -18F, a little exothermic etchant might be just what the doctor ordered!  :)

Know what else is exothermic?

300,000 gallons of five-year-old liquid hog manure in three giant under-barn pits...  Guess I won't be making an offer on that farmstead!

73 for now,

--Kirk, NT0Z
 
My book, "Stealth Amateur Radio," is now available from www.stealthamateur.com and on the Amazon Kindle (soon)


On Wednesday, January 20, 2016 6:49 AM, "Mark Lerman mlerman@... [Homebrew_PCBs]" <Homebrew_PCBs@yahoogroups.com> wrote:


 

I've used 12% peroxide. Be very careful using it and do it in a wellventilated area, preferably outside. The reaction is very exothermic andetching can be complete in < 1 minute. I finally went back to the 3%,often using a sponge to hasten and make the etch more even.

Mark

At 06:13 PM 1/19/2016, you wrote:


What ratio of the 12% hydrogenperoxide to acid do you use?  How long does a typical etch of oneounce copper take?  And how often do you have to “rejuvenateâ€it?
Thanks,
Mike K5ESS
 
From: Homebrew_PCBs@yahoogroups.com[mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Tuesday, January 19, 2016 4:00 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] My materials for "ColdProcess?"
 
 
At Sally Beauty they call their strongest hydrogen peroxide "SalonCare Maximum Lift 40 Volume Clear Developer."
 
FYI, "40 volume" = a 12% hydrogen peroxide solution.
 
It seems to be on sale now for $1.50 a quart = good deal :)
 
--Kirk, NT0Z
 
My book, "Stealth Amateur Radio," is now available from
www.stealthamateur.com and onthe Amazon Kindle (soon)
 
On Tuesday, January 19, 2016 3:46 PM, "'John Snyder'Kochcal@...[Homebrew_PCBs]"<Homebrew_PCBs@yahoogroups.com> wrote:
 
 
Roland
 
Thanks for the specific information.
Can you also tell us the printer and if it has oem toner or not
And an idea of the line width  and spacing size?
 
John
 
From:Homebrew_PCBs@yahoogroups.com[mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Monday, January 18, 2016 2:37 PM
To: Homebrew PCBs
Subject: Re: [Homebrew_PCBs] My materials for "ColdProcess?"
 


Boman33:
 
I just walked in from my shop where I just completed another perfectcold toner transfer using
a 2 to 1 ratio of "Top Care iso alcohol 70% to"Equate" nail polish remover, 100% acetone,
from my local Walgreen's emporium.
 
The PC laser image is on  Office One "Business Gloss"32lb. 92 brilliance (indication of glossy surface) paper.
This paper is  made by HammerMill Paper Co.
 
Next, I will try Office Max "High Gloss" photo paper, whichis thicker and much glossier
than the above, but much more expensive.  This stuff works quitewell with "Hot Transfer"
technique.
 
Regards,
 
Roland F. Harriston, P.D.
∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗