None of the pens I have tried, Radio Shack, Sharpie, or Mouser, have lasted
in Cupric Chloride.
The wood bleaching H202 is for cupric chloride, ONLY Do not use it for
Sodium or ammonia based etches.
In 8liters of diluted hcl, I used about 3 teaspoons of the wood bleach h202,
Over a month and about 20 or so 6X9 Dsided pcb I've gone thru 2/3 of the
bottle.
Besides FuCl (ferric), H8N2o8S2(Ammonium), there is CuCl2(Cupric Chloride)
and H-O5-S( Peroxy Sulfuric)
CuCl2 seems to be the choice for TT, and it does work well
Personally I've switched to H-o5-S , I had to use Lab grade 50% H202which I
purchased a 4L bottle from Post-apple scientific co.
http://www.postapplescientific.com/ I drove to PA to pick it up , cause
Freight shipping for 1 4L bottle was $100, the juice itself much cheaper. I
switched to acid tin plated etch resist. And Peroxy Sulfuric wont eat thru
the tin, like CUCl2 will. + I can reclaim the etched copper and reuse it in
my copper plating bath for thru holes, and no more chlorine smell.
JT.
----- Original Message -----
From: "pygar2" <pygar2@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Tuesday, March 09, 2004 10:22 PM
Subject: [Homebrew_PCBs] Sharpie compatibility, and other questions...
> I am a complete newbie at this, trying to learn enough to do it right-
> ish the first time...
>
> I'll be doing a toner-transfer from a photocopier. Does it need to be
> a laser copier or will a regular copier do?
>
> I don't plan on using ferric chloride. That leaves, as I understand
> it, sodium persulphate and ammonium persulphate. Are both these going
> to work OK with the Sharpie I plan to use for touch-up? I read in the
> archives of muriatic acid being used, which frankly is not somewhere
> I plan to go, but if I ever do, does toner transfer work with it?
>
> The strong peroxide in wood bleaching kits-- I read of someone using
> this in the archives, but don't know if it needs thinning, or whether
> it even works with toner transfer.
>
> Is there anywhere I can buy just an ounce or so of each of the
> persulphates, to try them out, see which one works for me? Hate to
> buy a kilogram of something and find out it is no good for my
> purposes... and since all I have right now to do is one photoetch
> pattern I've made for some brass detailing parts I want to make, I
> don't need a huge amount of anything.
>
> TIA for any helpful advice!
>
>
>
>
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