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Recent interest in the use of Rilver as a bacteri cidal agent led to the study of analytical m ethods suita ble for det erminin g silver in the small concentrations employed for these purposes. A sensitive and a ccurate colorimetric method, in which p-dimethylami nobenzalrhodanin e is used, was developed. Soft-glass dishes are not, suita ble for use in the analyti cal procedure because of a yery pronounced adsorption of silver on such surfaces. Di shes of fu sed silica or of P yrex glass were satisfactor y . Chlorirles, sulfat es, and cupr us and m er curous salts interfere with this colorimetric det erminatio n.