Test for sugars - Answer Add Benedicts solution.
Test for starch - Answer Add iodine solution
Test for proteins - Answer Add biuret solution
Test for lipids - Answer Add sudan III stain solution
Colour change for sugars - Answer blue --> green (least sugar), yellow or brick-red
(most sugar)
Colour change for starch - Answer browny-orange --> black/blue
Colour change for proteins - Answer blue --> pink/purple
Colour change for lipids - Answer Separate out into two layers. The top layer will be
bright red.