Homebrew PCBs

When I made boards back in the late 70's I used ammonium persulfate 
most of the time.  Works good, no stains.
I have no idea if it's still readily available or where to get it.


Steve


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At 06:56 PM 7/2/2017, you wrote:
>I have been using ferric to etch boards for a while now.  Recently I 
>got lucky and came into a cache of 1973 vintage copper clad PCB 
>stock, which will enable me to make some reproduction pieces that 
>are pretty much indistinguishable from originals in terms of 
>look.  However, I have noticed that the ferric solution stains these 
>boards, adding a yellowish tint.  Is there any way to avoid 
>this?  Or clean it after?