Where do you live that sulfuric acid is illegal?! It’s a basic chemical, I use it all the time. Tried some last night in an ultrasonic cleaner last night. (Didn’t work for that project. 🤷🏻♂️) You can go to the auto store and get a 5-gallon bucket.
And talk about environmentally neutral, doesn’t get much better. I forget the chemistry term, but it “dilutes” in water instantly. That is to say, it ain’t sulfuric acid anymore. When I’m working with it, I just leave the tap running in case of a spill. Or, just throw baking soda on it, receive water and carbon dioxide.
Most of mine comes from draining old car batteries. If I have to give the battery back for proper recycling and get my $10 back, I’m keeping the acid. What if you do that? Illegal to buy, own or both?