Cauldron

A large cauldron that, when filled, can be painted to colorize the glowing ink within.

“The properties of this inky liquid are still largely uncertain, and drinking it is simply out of the question. I made that clear to Dr. Stern. In the meantime, we'll focus on its immense affinity when exposed to various dyes. That little lightshow ought to keep him out of trouble, if only for a bit. - Dr. Derek Manse”