You are in the lab and notice another student applying cosmetics, why is this dangerous and not allowed in a lab? cosmetics can pick up gases in the lab and those can infect the eyes and mouth. cosmetics contain harmful substances and can contaminate the experiment cosmetics are tested before they are put on the market so they should not harm the person. as long as the student is wearing gloves there is no harm in applying cosmetics in the lab.

Alright, let's explain this, shall we?

Cosmetics are applied for facial uses, and they are only tested on specific body sections, and not necessarily with the gases used in chemicals, which may cause a crazy reaction with the cosmetics there!
Wearing gloves is only step one, but of course, that doesn't cover anything.
According to this, unfortunately, it is wrong to have any cosmetics around the lab because of the reactions with it.

Hope this helps!
If this is marked as Brainliest, i'd truly appreciate it! 

Very minute and important evidence needs to be collected in order together detail and figure out what had happened