When you walk into any type of lab, safety symbols should be present. It doesn't matter if it is a middle school, college or university or a medical laboratory. Although many of the signs and symbols posted may seem redundant or even not necessary, they are there mainly to prevent accidents. When new to a lab, make sure you familiarize yourself with all of the symbols and signs posted.
Pink may be pretty, but also toxic when it is labeled as a biohazard.