Skin contact with gold and gold alloys

3 types of reaction to gold merit discussion. First, there is the effect known us black dermographism, in which stroking with certain metals immediately produces well‐defined black lines on the skin. Some gold alloys art amongst such metals. The evidence indicates that the effect is the result of impregnation of the skin with black metallic particles generated by mechanical abrasion of the metals by contaminants of the skin. There is no positive and unequivocal evidence of the ability of metals lo mark uncontaminated skin so rapidly that it is possible to write upon it.