摘要: Subjects experimentally photocontact sensitized to tetrachlorosalicylanilide (TCSA), tribromosalicylanilide (TBS), and bithionol were studied with regard the quantity of long ultraviolet rays (UV) necessary elicit reactions. Less than one second high energy UV, about 20 seconds or less midday summer sunlight, will photoallergic reactions in highly persons. Unlike sunburn, can readily occur on hairy scalp palms, though usually lesser intensity. Reactions be elicited through cotton woolen cloth, adhesive tape, bond paper. Two thicknesses desk blotter paper afford a complete light seal.