Reagent label
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Reagent labels are sheets of paper or plastic which display written or printed information about the chemical from the reagent bottle they're attached to.
General
Labels generally contain the name of the chemical, the "fire diamond", information about composition (purity, impurities), sensitivity to air, light, moisture, physical properties (melting/boiling point, density, flash point, autoignition point, sometimes solubility/miscibility), chemical compatibility, disposal method, expiration date, etc.
The name of the chemical is not always written in very large characters, but it's generally positioned on the label for easy finding.
DIY label
While simply writing the name of the chemical on a piece of paper and gluing it on the bottle with duct tape is the simplest method, one can also create more complex labels, using various software like MSPaint of MicrosoftWord and then printing the resulting label. To protect it from corrosive chemicals or solvents, the label can be covered with transparent duct tape.
You can also use various online tools for making reagent labels, such as Mysafetylabels.
Various label templates for chemicals have been uploaded on the SM forum by many users. To find them, check the links below.