Food Tests

Question 1

Food test for sugar:

Answer 1

Reagent:
Benedict (heat it)

Negative:
Blue

Positive
Green—> brick red

Question 2

Food test for starch:

Answer 2

Reagent:
Iodine

Positive:
Yellow-brown

Negative:
Blue/black

Question 3

Good test for protein:

Answer 3

Reagent:
Biuret

Negative:
Blue

Positive:
Lilac-purple

Question 4

Food test for fats (emulsion test):

Answer 4

Reagent:
Ethanol+water

Negative:
Clear

Positive:
Cloudy/milky colour