Homebrew PCBs

Quoth Howard at 2008-06-05 00:23...

> Anyway what i am wanting to know is, how meny grams of Ammonium 
> persulfate do i mix to 3 ltrs of water, to etch Fotoboard 2 pcb ?

I have just fished the old lemonade bottle from under my bench in which 
I used to store partially used ammonium persulphate.  As I always forget 
these things, I had been careful to label it:

64g in 250ml

I've used sodium hydroxide before but have one too many overdevelopments 
on Kinsten PCB stock, so now use sodium metasilicate, which is much less 
vicious.  I know, however, that there are others on this list that swear 
by sodium hydroxide (I merely swear at it.)

HTH

Cheers

M


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Matthew Smith
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