Homebrew PCBs

If the acid is cool, the reaction is very slow, so it's not an issue. 
Still, not the best way to remove paper.

BTW, concentrated sulfuric acid is available as professional drain 
cleaner in some hardware stores (an example brand is Zonk plus); in some 
instances it has dyes and/or buffers added, but it will destroy paper 
quite fast.

If you dilute concentrated acid, be careful of flash boiling as the 
dilution is very exothermic.


AnaLog Services, Inc. wrote:
> I had not thought of it before, but Sulfuric acid will attack cooper, no? 
> Copper sulfate?