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NOTE ON THE KEEPING OF HYDROGEN PEROXIDEAMMONIA HYPO ELIMINATOR SOLUTIONS
This is an addition to the paper on "The Elimination of Hypo from Photographic Images," by J. I. Crabtree, G. T. Eaton, and L. E. Muehler, published in the November, 1940, issue of the JOURNAL on p. 484.
In connection with the preparation and use of the hydrogen peroxide-ammonia hypo eliminator solutions described in the November issue, it is important to realize that such solutions give off oxygen continuously, but in spite of this decomposition, they possess a satisfactory exhaustion life. However, the mixtures must not be stored in closed containers at any time. The hypo eliminator solution should be mixed just before use and kept in open containers until discarded.
When storing the 3 per cent hydrogen peroxide solution used for preparing the hypo eliminator solution, the following precautions should also be taken:
(1) The solution should be stored in a brown bottle away from daylight and in a cool place since both heat and light accelerate the decomposition of hydrogen peroxide.
(2) An ordinary loose-fitting cork rather than a screw cap type of stopper should be used.
(5) If the bottle is large, a small-bore glass tube should be inserted through the cork to permit the oxygen gas to escape and thus avoid the possibility of pressure being developed, resulting in bursting of the bottle.
(4) Large-scale users should consult with the manufacturers on precautions hi handling and storing hydrogen peroxide solutions.
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