My chemisty project, got any ideas?

Question

we have to use our product to come up with 2 reasons how a chemistry teacher would use it. my item is ink, its a bit too easy because we have to come up with creative reasons. a good example is if your item was plastic bags then they could use it if there was a fire to jump out of a window and use it as a parachute. ANY CREATIVE IDEAS FOR INK?????

thanks :)

i dont wanna have to use boring ideas.

Answer 1

use ink to give you an A

Answer 2

thin layer chromatography is the first obvious choice.

Also, we use ink to write on glassware.. A VERY IMPORTANT PART of being a chemist that is often overlooked by novices.  

You wouldn't know how many times an unlabeled beaker has resulted in the loss of several hours of work because we have to figure out what it is in order to dispose it properly.

Answer 3

Invisible ink? Chaff Ink Pen where you click it and it does its thing?