Objective/Introduction
It’s a joke shop classic… disappearing ink. There’s just something funny about squirting dark blue “ink” on someone’s shirt only to have it disappear like magic. Best of all, there’s actually some great acid-base chemistry behind all of the prankster fun.
Required
thymolphthalein (a common acid-base indicator in the form of a powder)
ethyl alcohol
3 molar sodium hydroxide
water
safety [...]