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A detailed description is given of a method by which gold can be visualized in frozen, paraffin and Epon sections. Histological sections from animals treated with gold compounds are exposed to UV-light from 30 min to several hours. The reduced, metallic gold is then visualized by means of a photographic developer containing silver lactate. Light- and electronmicroscope photographs showing gold in different organs from rats and mice treated with aurothioglucose, aurothiosulfate and aurothiomalate are presented.