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GCSE Biology Paper 1 (9-1 Exams)

Sudan Iii Sample Food Test Tube Stain Solution

Front List out the steps in detail to carry out a Sudan III Test.
Back
  1. Prepare 5 cm3 sample of food into a test tube
  2. Use a pipette to add 3 drops of Sudan III stain solution to the test tube and gently shake the tube.
  3. Sudan III stain solution stains lipids.
  4. If the food sample contains lipids, the mixture will separate out into two layers. The top layer will be bright red.
  5. If no lipids are present, no separate red layer will form at the top of the liquid.

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