Science labs, particularly chemistry labs, have a lot of safety signs. This is a collection of public domain images you can use to learn what the different symbols mean or to construct signs for your own lab.
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From Anne Marie Helmenstine, Ph.D., About.com
Chemistry Laboratory Safety RulesHow to Use MSDSsCommon Names for Chemicals
Chemical Weapons & Warfare AgentsWhat Is the Most Poisonous Compound?Incompatible Chemical Mixtures
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