Testing for Protein - the biuret test

Aim: To test if a sample of food contains protein.

Equipment: Test tube, sodium hydroxide (NaOH), copper sulfate (CuSO4), food sample.

Method:
1)Place about 2mL of the sample into a test tube and add 5 drops of sodium hydroxide.
2)Add 5 drops of copper sulfate.
3)Shake the test tube gently from side to side.

Results:

This is the one with the Milk in it but mixed with the two Chemicals (Sodium hydroxide, Copper sulfate). We were trying to get a different colour instead of just blue because of how much Protein. The main colour and the main thing in the experiment was to see the Colour from both milk and egg change to the exact same thing.   

Conclusion:
It was to see the milk and egg change to the same colour, because of its protein both have the same amount of protein to change to a certain colour.