Neil, Nitin & Mukesh were provided with a test tube each containing China rose solution with was Pink in colour. Neil added two drops of solution 'A' in a test tube and got dark pink colour. Nitin added two drops of solution 'B' to his test tube and got green colour. Mukesh added two drops of solution 'C' in his test tube and got no change in colour. Suggest the possible cause for the variation in their result.
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