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PRIMULINE

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Originally appearing in Volume V22, Page 342 of the 1911 Encyclopedia Britannica.

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PRIMULINE , a dye-stuff containing the thiazole See also:

RING (O.E. hring; a word common to Teutonic languages; and probably cognate with the Lat. circus, Gr. KtpKOS or KpLKOS, Skt'. chakra, wheel, circle, cf. also " harangue "); in art, a band of circular shape of varying sizes, made of any material and used f

ring See also:

SYSTEM

system conjointly with a See also:

BENZENE, C6H6

benzene ring. The primulines are to be considered as derivatives of dehydrothiotoluidine (aminobenzenyltoluylmercaptan), which is obtained when See also:

para-tolui- S\ CH „/\/ •CBH4.NH,(p) \/\N/ Primuline. dine is heated with See also:

SULPHUR

sulphur for eighteen See also:

HOURS, CANONICAL

hours at 18o–xgo C. and then for a further six hours at 200–2200 C. (P. Jacobson, Ber., 1889, 22, p. 333; L. Gattermann, ibid. p. 1084). Dehydrothiotoluidine is not itself a dye-stuff, but if the See also:

HEATING

heating be carried out at a higher temperature in the presence of more sulphur, then a See also:

BASE

base is formed, which gives primuline yellow on sulphonation (A. G. See also:

Green, Journ. See also:

Soc.

Chem. Ind., 1888, r, p. 194). Primuline-yellow is a mixture of See also:

SODIUM [symbol Na, from Lat. natrium; atomic weight 23.00 (0=16)]

sodium salts and probably contains in the See also:

MOLECULE (from mod. Lat. molecula, the diminutive of moles, a mass)

molecule at least three thiazole rings in See also:

COMBINATION (Lat. combinare, to combine)

combination. It is a substantive See also:

cotton dye of rather fugitive shade, but can be diazotized on the fibre and then See also:

DEVELOPED

developed with other components, so yielding a See also:

SERIES (a Latin word from serere, to join)

series of ingrain See also:

COLOURS, MILITARY

colours. Thioflavine T is obtained by the methylation of dehydrothiotoluidine with methyl See also:

ALCOHOL

alcohol in the presence of hydrochloric See also:

ACID (from the Lat. root ac-, sharp; acere, to be sour)

acid [See also:

German Patent 51738 (1888)]. Thioflavine S results from the methylation of dehydrothiotoluidine sulphonic acid. This sulphonic acid on oxidation with See also:

BLEACHING

bleaching See also:

POWDER (through O. Fr. puldre, modern poudre, from Lat. pulvis, pulveris, dust)

powder or with See also:

lead peroxide, in alkaline See also:

SOLUTION (from Lat. solvere, to loosen, dissolve)

solution yields chloramine yellow, which dyes cotton a beautiful yellow.

End of Article: PRIMULINE

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