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An aniline derivative tint should not be used if the allergy test result is positive, because this indicates that the individual has an allergic reaction to the compound. It is important to avoid using products that may cause an allergic reaction, as it can lead to discomfort and potential health risks. Options B, C, and D all indicate a negative result or no reaction, so they would not be harmful to use. However, if an individual has a known allergy to aniline derivative tints, it is best to avoid using them altogether, regardless of the test result.