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Joe Begley wrote: >A dermatology colleague has a 33 yr old female patient who complains that, >when she sweats, the sweat is coloured blue. He has not personally witnessed >this and suspects possible interaction with clothing as the cause. He did >ask whether there might be a chemical or biochemical explanation. I would be >interested to know if any learned colleagues on the mailbase have come >across anything like this or have any suggestions. While she takes no >prescribed medication I don't believe the possibility of self medication has >been explored. Have you looked at her urine? Blue urine is usually caused by indanthrene or its precursors. When exposed to air the indanthrene is oxidized to indigo. Maybe the sweat also can contain indanthrene? Sten Öhman, PhD Elfin Lab & Milieuconsult - Part of the Wiltag group E-Mail address: [log in to unmask] Telephone int: +46 13 368941, Nat: 013-368940 Fax int: +46 13 368941, Nat: 013-368941 Mobile tel: 0709-526415 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%