Homebrew PCBs

Thomas wrote:

> Hi
> any suggestions for an Acid that will eat paper and not the Copper
> Thomas :)
> 
I've spilled 98% sulfuric on paper, and it turns charcoal black in 
seconds. I assume your after something a little easier to handle. Normal 
20% sulfuric (car battery strength) eats holes in cotton after about 24 
hours. Might do the same to paper since they are both derived from 
cellulose.
Have you tried strong sodium hydroxide ? I think this can soften paper.