orange. i love the color for its representation of postitive energy
A negative test would result in a color that is notviolet.
The presence of protein.
Conclusion: Your partner has hiv and you don't.......yet.
A positive test, when using Biuret reagent, would be purple-ish
You could use a biuret test, because a positive result (signified by the presence of pink-violet color) indicates the presence of a protein with two or more peptide bonds. If such a protein is not present, the blue color of the cupric sulfate (which indicates a negative result) will remain.
If soluble protein is present the solution will turn from light blue to purple. if there is none there will be no reaction.
in biuret test the presence of peptide bonds gives a violet color. but it should be noted that a minimum of two peptide bonds should be present in the protein to get a positive answer to this test.