You had better not dare any experiments or "There is a good chemistry between the two of us". The small tubes made of glass are open on one side and are used in laboratories. Represents chemistry lessons, experiments or tests.
The test tube emoji was introduced in 2018 and released as part of the Unicode 11.0 standard. This emoji can be found under the objects
category. Because the test tube emoji has not been around for very long, it might not display correctly in some operating systems.