"Invisible copper" experiment from the "Chemistry for spies" set
Channel: MEL Chemistry
Date: 2018-08-09

Perform this amazing experiment at home with MEL Science: https://melscience.com/en/experiments/invisible-inks-with-copper-sulfate/

Safety
* Put on protective gloves and eyewear.
* Conduct the experiment on the plastic tray.

Disposal
Dispose of solid waste together with household garbage.