blue

(blu). 1. The color of the sky; one of the principal colors of the spectrum. 2. Having the color of the clear sky. acid b. See cyanol 6. ali- b., a blue dyestuff derived from anthracene. anthracene b., alizarin blue. cresyl b., a basic coal-tar color of the oxazin type. cyanol b., a bright blue acid coal-tar color related to triphenylmethane. diamin b., any one of several coal-tar colors derived from benzidin or toluidin. indigo b., indigotin. Léffler’s b., 30 c.c. of concentrated alcoholic solution of methylene-blue diluted to 100 c.c. with a 1: 10,000 aqueous solution of pota ium hydroxid: used for staining bacteria. methyl b., an antiseptic compound, NaCy;H3¢- N,S3Oo;, used locally in diphtheria. Called also diphenyl am in 6. methylene b., a blue coaltar dye, used as a histologic stain: therapeutically it is analgesic and antirheumatic. Dose, 2-4 gr. (0.13-0.26 gm.). pyoktanin b. See pyoktanin. trypan b., a benzidin dye employed in the treatment of trypanosomiasis and piroplasmosis. blue-bottom. A blue pigmentation of the skin in the sacral, coccygeal, and gluteal region.