| 单词 | chrome alum |
| 例句 | This he made manifest by looking through a bottle containing solution of chrome alum, when the central portion of the field of view appears of a light red colour for the first second or two. Heroes of Science: Physicists 2012-01-17T03:00:17Z For special purposes chromium fluoride, chrome alum, &c., are employed. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z The difference between chrome alum and alum crystals is principally that chrome alum has twice the strength of alum crystals, being a double salt, instead of the commercial alum usually sold. Harper's Round Table, August 13, 1895 By adding sodium phosphate to an excess of chrome alum the violet phosphate, CrPO4�6H2O, is precipitated; on heating to 100� C. it loses water and turns green. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" For example, episomorphs of white potash alum and violet chrome alum, of white magnesium sulphate and green nickel sulphate, and of many other pairs of salts, have been obtained. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" The mixture should be employed immediately after adding the chrome alum. Photographic Reproduction Processes On evaporating the solution these substances crystallize out as potassium chrome alum, which substance is produced as a by-product in the industries using potassium dichromate for oxidizing purposes. An Elementary Study of Chemistry Both chrome alum and alum crystals are used for the same purpose in photography, for clearing and hardening the film of the negative. Harper's Round Table, August 13, 1895 What is the difference between chrome alum and alum crystals. Harper's Round Table, August 13, 1895 |
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