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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Science Laboratory Safety Signs
Collection of Safety Symbols
From Anne Marie Helmenstine, Ph.D., About.com
More Lab Safety Information
Chemistry Laboratory Safety RulesHow to Use MSDSsCommon Names for Chemicals
Poisonous Chemicals
Chemical Weapons & Warfare AgentsWhat Is the Most Poisonous Compound?Incompatible Chemical Mixtures
Chemistry Tools
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