If vegetable oil is made of lipids, then the oil would turn in the presence of sudan iii because it is an indicator of lipids. orange/pink black red blue

The Susan 3 indicator of lipids react with the lipids or triglycerides to form stain red colour. The Sudan 3 contains alcohol and the lipids or triglycerides are soluble in alcohol. Hence it reacts to form a stain red solution in ethanol which is stain red in colour. Hence the correct answer is red colour.

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Sorry its not enough info