Biurets test Nonfat milk, tube 3 has HCl added

[blindgalz]

but what i want to know is what is the difference between the clear violet and cloudy purple as results from Biuret test

[FashionStatementz]

tube 1 control tube distilled water I think

tube 2 and 3 the milk but tube 3 with HCL.

Thats what I think

[sparkldog]

I wonder what tube 1, 2, and 3 has in it...