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The biuret test is a chemical test for proteins and polypeptides. It is based on the biuret reagent, a blue solution that turns violet upon contact with proteins, or any substance with peptide bonds. The test and reagent do not actually contain biuret; they are so named because both biuret and proteins have the same response to the test.
The reagent only exists as solution, and thus all of its properties are derived from it.
[HERE] is a ScienceMadness thread about making Biuret Reagent.