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A sample of ethanol may have other additives added to the solution. Typically a laboratory can purchase either denatured ethanol or pure ethanol. Denatured ethanol may have acetone, isopropyl alcohol, methanol, or other volatile solvents that are poisonous for ingestion. It prevents other people from drinking this stock of ethanol: it will not only taste bad, but it will have other serious side effects. Most chemistry and Biology work can tolerate using denatured alcohol, especially if it is used mainly to clean the benches. However, DNA extractions which require 200 proof ethanol can not tolerate contaminants.

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