I had a lady in this morning for a skin test and a consultation her hair is wrecked so I was also cutting it today too. When I was asking about colour history she said she had a little blonde in her hair with an all over "browny blonde" colour on the rest. Then she started to colour it herself with nice and easy, then she went to a salon to get a darker all over colour put on. She said when she was in the chair waiting for her hair to process her hair started warming up and smelling of metal. So obviously I took hair from her and did an incompatibility test but there was reaction. What do you think it could be?