Based on the picture, what safety practice did both students fail to carry out?

On the basis of the picture, both the students forget to wear the proper laboratory attire.

Explanation:

Laboratory attire are the clothes and the proper safety equipment that the people who are entering the laboratories for performing any kind of experiments have to wear. The main purpose of wearing this proper attire for these people are to keep themselves safe in case of any kind of mishap at the time of the experiment.

The equipment that the attire of the laboratory should have include the protective eye wear, the gloves, the lab coat and some other things also to protect themselves.

your answer is going to be physical weathering