Reagents are a type of chemical which react to a specific compound, typically changing color or opacity when that compound is present. Usually, you add a few drops of a reactive chemical into a container of your sample, and look for a color change. Some reagents are dried onto flat strips or put inside glass tubes (for air testing).

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Water quality /wiki/water-quality 4 months ago by warren 18 276 3
Reagents /wiki/reagents over 1 year ago by warren 2 324 0
Pesticide Detection Methods Development /wiki/pesticide-detection-methods-development over 4 years ago by silverhammer 27 683 6