Blue Saxon

Other dyes based on the indigo motif are known, many with different hues. Tyrian Purple, 6,6 -dibromoindigo, is a natural product isolated from cmshed sea shells that was quite valuable in ancient times but is not sold commercially today. However, the (5,7,5, 7 )-tetrabromo derivative (blue, Vat Blue 4B ) and the (5,5 )-bis-sulfonic acid analog (blue-green, Blue Saxon ) both are used as dyes in the... 

Associated terms for smalt include azur d poudrer, azurblau, azure, bleu d email, blue sand, Bohemian blue, Dumont s blue, Dutch ultramarine, email, enamel blue, eschel blue, Isenbuig blue, Kaiserblau, Konigsblau, powder blue, royal blue, Saalfeld blue, Sachsischblau, saffer blue, Saxon blue, Saxony blue, Schneebeig blue, Silesian blue, starch blue, streublau, Swabian blue and violet blue. Salter (1869) indicates that powder blue was... 

Sachsischblau, n. Saxon blue, smalt (sometimes) indigo a kind of Prussian blue, sacht, sachte, a. soft, gentle, light, smooth, easy (of silk) scoured. — adv. softly, gently, gradually. 

Flexibility of meaning persisted well beyond this period. According to Tingry (1804), azure was a vitreous oxide of cobalt (that is, smalt) and also called enamel blue, saffer blue and Saxony blue, as it is manufactured on a large scale in Saxony, where mines of cobalt are abundant. From this circumstance only it has acquired the denomination of Saxon blue. Ure (1875-78) on the other hand writes of The darkest-coloured smalts, known as King s-blue or azure. According to Heaton (1928), azure cobalt was a pale cobalt blue . 

Azurite Lazurite Smalt Ultramarine Bice Cobalt blue Enamel blue King i blue Lapis lazuli Saxon blue... 

Historical term used for smalt q.v.), possibly as a source variant. Presumably related as a term to saxon blue and perhaps also saxony blue (qq.v.). 

Riffault et al. (1874) describe this pigment as s3monymous with indigo carmine (q.v.). There is however, a further contradictory reference to this in Riffault et al. as synonymous with smalt (. v.), Saxony being where this colour is prepared the best . Tingry (1804) also considers this to be vitreous oxide of cobalt or smalt. See also Saxon blue. 

Indigoid group Smalt Indigo carmine Saxon blue Riffault et al. (1874) 268, 361 Tingry (1804) 300... 

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