Test tube, used for conducting chemical experiments in a laboratory.
Depicted as a transparent cylinder, open at one end, filled with green liquid.
Positioned at a 45° angle.
Can be used for a variety of content related to chemistry and science.
Can also represent other liquids, such as potions or medicines, and metaphorically for laboratories and experiments.
Some platforms include volume markers or show liquid bubbling.
WhatsApp's design features a blue liquid.