300
JOURNAL OF CHEMICAL EDUCATION
FEBRUARY, 1932
There are sometimesundesirable effects incidental to the use of ozone as a bleaching agent. For example, i t cannot be used to bleach flour since the taste is affected. Nor can it be used to bleach dextrin and glue because their adhesive properties are impaired.
Literature Cited (1) Encyclopedia Britannica. 14th edition. Encyclopedia Britannica Pub. Co., Ltd., London, 1931, Vol. 16, pp. 10076. Ozone. ( 5 ) MELLOR,JOHN W., "A Comprehensive Treatise of Inorganic and Theoretical Chemistry," Vol. I. Longmans, Green & Co., New York City, 1922, pp. 877-961. (3) New International Encyclopedia. 2nd edition. Dodd Mead & Ca., New Yark City, 1916, Vol. 17, pp. 674-5. (4) Nelson's Loose Leaf Encyclopedia, Thomas Nelson & Sans. New York City, March. 1928, Vol. 9, pp. 1 3 7 6 . (5) "New Apparatus for Water Works," Sci. Am., 139,545 (Dec.. 1928). (6) COCHFANAND GRAHAM,"Ozone Increases the Tensile Strength of Textiles," Sci. Am., 139,544 (Dec., 1928). (7) "U. S. Patent for Bleaching Textiles," Chemicals, 34,31-2 (Sept. 8,1930): U. S. P. 1,760,042.
General References DEMING,"General Chemistry," John Wiley & Sons, Inc., New York and London, 1923, pp. 27, 28. HOLMES,"Introductory College Chemistry," The Macmillan Co., New York City. 1925,2&30. MCPHERSON AND HENDERSON, "A Course in General Chemistry," Ginn & Co.. Boston, 1927,424. NEWELL,"College Chemistry," D. C. Hea* & Ca., New York City, 1925,3842. KENDALL,"Smith's College Chemistry." The Century Co.. New York City, 1929, pp. 295-7. SNEE~ "General . Inorganic Chemistry," Ginn & Co., Boston, 1926, pp. 3 2 4 .
plates sensitive New orocess of ohotoeranhv - - . . bv. ultra-piolet lizht. - Photonraphic . . . t o ultra-violet light will shortly be made commercially by a new process, Dr. C. E. K. Mees of the Eastman Kodak Company has reported t o the Optical Society of America. "Schumann" plates used for this purpose until now were difficult t o make and had t o be prepared by hand. They had a mating either entirely free from gelatin or containing only a small trace of gelatin t o bind the silver bromide together. I n order t o avoid the use of Schumann plates, two Frenchmen, Duclaux and Jeantet. suggested the treatment of ordinary plates with a fluorescent substance which glows when exposed t o ultra-violet light, and they employed petroleum ails t o paint i t on the plates. Satisfactory results have been obtained by many workers with petroleum, but i t is difficult t o apply the oil uniformly and t o remove i t before development. R. E. Burroughs of the staff of the Kodak Research Laboratories tested a large number of organic substances and found the mast suitable to be ethyl dihydrwllidine dicarboaylate, which fluoresces strongly in the ultra-violet. This substance can be applied in organic solvents, from which it crystallizes in microscopic crystals over the surface of the plate, these crystals being easily removed before or during development of the plate.-Science Senice
