Dimethylglyoxime (DMG) - one drop on a cotton bud is rubbed over a metal item. The reddish-purple colour indicates nickel content
Keywords: Allergic contact dermatitis, Ammoniacal solution of dimethylglyoxime, Contact allergy, Nickel spot test solution, Nickel-positive, Non-clinical image, Redddish-pink cotton bud tip
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Source: Dr Ian Coulson
