METHOD FOR DETERMINING RESIDUAL THIOSULFATE AND TETRATHIONATE IN PROCESSED PHOTOGRAPHIC PAPERS.

The article informs that the American Standards Association (ASA) approved on February 27, 1950 the American Standard Method for Determining Residual Thiosulfate and tetrathionate in Processed Photographic Papers sponsored by the Optical Society of America. The ASA classification is Z38.8.25-1950, and the UDC 77.023. The Standard contained in an eight page leaflet may be secured from the American Standards Association Inc., 70 East 45th Street, New York 17, New York, at a cost of $0.35 (thirty-five cents). From the same source a free list of all standards approved to date, including 142 dealing with photography, is available.