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The DEW data center (callsign DYE, [1) at Cape Dyer on the eastern tip of Baffin Island was 1 of 4 "Canadian Main stations" (cf. PIN, CAM, FOX) and in January 1959, the station's manning switched to an RCAF Squadron Leader being the "Officer-in-Charge" as "DEW Sector Commander", 1 of 5 RCAF officers at DYE (2 additional officers were USAF). [1]: 79
Solvent Violet 13, also known as D&C Violet No.2, oil violet, Solvent Blue 90, Alizarine Violet 3B, Alizurol Purple, Duranol Brilliant Violet TG, Ahcoquinone Blue IR base, Quinizarin Blue, Disperse Blue 72, and C.I. 60725, is a synthetic anthraquinone dye with bright bluish violet hue.
1,4-Diamino-2,3-dihydroanthraquinone: Solvent violet 47 61690 anthraquinone 81-63-0: Solvent Red 26: Oil red EGN Solvent red 26 26120 diazo 4477-79-6: Solvent Violet 13: Oil violet 401 D&C Violet No.2 Solvent violet 13 Disperse blue 72 60725 anthraquinone 81-48-1: Solvent Yellow 56: Euromarker Sudan 455 Solvent yellow 56 11021 azo 2481-94-9 ...
Another example of a leuco dye is the crystal violet lactone, which in its lactone form is colorless or slightly yellowish, but in low pH, when it is protonated, it becomes intensely violet. [1] Other examples are phenolphthalein and thymolphthalein , colorless in acidic to neutral pH, but becoming pink and blue in alkaline environment.
Methyl violet 2B (Tetramethylparosanilinium chloride, 4,4'-[(4-Imino-2,5-cyclohexadien-1-yliden)methylen]bis(N,N-dimethylaniline)hydrochloride) is a violet triarylmethane dye from the group of cationic dyes and an essential component of C.I. Basic Violet 1 (trivial name methyl violet).
The first anthraquinone-based synthetic vat dye was indanthrone (C.I. Vat Blue 4) - the synthesis of which was developed by René Bohn in 1901: Synthesis of indanthrone By dimerization of 2-aminoanthraquinone ( 1 ) under strongly alkaline conditions at 220-235 °C, intermediate stage 3 is obtained in two steps, which is cyclized ...
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Azo violet (Magneson I; [1] p-nitrobenzeneazoresorcinol) is an azo compound with the chemical formula C 12 H 9 N 3 O 4. It is used commercially as a violet dye and experimentally as a pH indicator, appearing yellow below pH 11, and violet above pH 13. [2] It also turns deep blue in the presence of magnesium salt in a slightly alkaline, or basic ...