Food tests

What is the test for starch?

iodine

What is the test for glucose?

Benedict’s reagent

What is the test for protein?

biuret’s reagent

What is the test for fats?

Sudan III

What does iodine look like initially?

orange

What does Benedict’s reagent look like initially?

blue-green

What does biuret’s reagent look like initially?

blue

What colour is Sudan III?

red

What does a positive test for starch look like?

iodine turns blue-black

What does a positive test for glucose look like?

Benedict’s reagent turns brick red

What does a positive test for protein look like?

biuret’s reagent turns pink-purple

What does a positive test for fat look like?

Sudan III forms a red line at the top