ULTRA-VIOLET RAYS AS A TEST OF COLOR.
An industrial application of the ul-tra-violet rays has been reported from the North of- Germany. These rays constitute the chemically active portion of sunlight, responsible for such effects as sunburn and the fading of colors, and the light of the new mercury vapor lamp—the form using tubes of quartz instead of glass—is exceedingly rich in them. The German carpet-makers and dealers in dyes were formerly obliged to send their products away to be tested in the strong sunlight of the South. This is no longer necessary, as the active rays of the artificial light have proved very effective in determining the durability of colors.
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Northern Advocate, 12 June 1913, Page 3
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111ULTRA-VIOLET RAYS AS A TEST OF COLOR. Northern Advocate, 12 June 1913, Page 3
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