Phosphoric acid, hydrochloric acid, and boiling sulfuric acid: I should have paid more attention in chemistry lab. This is a neat project and answered a lot of questions.
It's not as scary as it sounds :-) For a chip this small, I only need a few drops of chemical, which cuts the risk way down. I don't have beakers full of hydrofluoric acid and red fuming nitric acid, like the real decappers.