The first recorded use of Persian blue as a color name in English was in 1669. The color azure is also named after the mineral lapis lazuli. Persian blue is a representation of the color of the mineral lapis lazuli which comes from Persia and Afghanistan. The color Persian blue is named from the blue color of some Persian pottery and the color of tiles used in and on mosques and palaces in Iran and in other places in the Middle East. Other colors associated with Persia include Persian pink, Persian rose, Persian red, Persian orange and Persian green. ( Passaic Color & Chemical Co.Persian blue comes in three major tones: Persian blue proper: a bright medium blue medium Persian blue (a medium slightly grayish blue that is slightly indigoish) and a kind of dark blue which is referred to as Persian indigo, dark Persian blue, or regimental, that is much closer to the web color indigo. Permavat Indigo NS Gran ( Standard Dyes ) Patco Indigo ( BF Goodrich Specialty Chemicals ) NACCO Indigo 20% Pst.( Buffalo Color Corp. Mitsui Indigo Pure ( Mitsui Toatsu Chemicals Ltd ) Mitsui Indigo Paste( Mitsui Toatsu Chemicals Ltd ) Indigo Pure Blue Powder 94%( Fenchem Enterprises Ltd) Indigo Pure( Sinochem Jiangsu Wuxi Imp & Exp Corp) Indigo Pure ( Sinochem Hebei Imp & Exp Corp) Indigo Pure ( Sinochem Tianjin Imp Exp Corp) Indigo Powder( Chemische Fabriek Triade BV) Indigo Blue( Hangzhou Dikai Chemical Co Ltd) Indigo 20% Pst.( Passaic Color & Chemical Co. Indigo ( Sinochem Liaoning Import & Export Corporation) Indigo ( Sinochem Shanghai I/E Corp/Schecho PuDong Corporation) StandardĪvat Indigo Blue ( Aashiana Dyestuffs Inc )Ĭonvat Blue A ( Concord Commerce Company) Pigment Blue 66 and the same chemical structure. Pure product is used in food dyes, can also be processed into organic pigments. Can also be used for wool and silk carpets and handicrafts in the application. Mainly used for dyeing cotton yarn and cotton cloth. Alkaline reduction leuco pale yellow acid is a colorless leuco restored. The concentrated sulfuric acid for the yellow green, diluted with blue precipitate in concentrated nitric acid to form isatin, a red yellow. Soluble in hot aniline, insoluble in ethanol. Properties and Applications: Navy blue to red navy. 2 – thio- isatin the reaction intermediate product is not isolated (Sandmeyer method ) This method is mainly on the preparation of (E) -2 – (3-oxobenzo thiophen-2 (3H) – ylidene) benzo thiophen-3 (2H)-one aniline is important, it can be used in boiling 25% sulfuric acid solution is hydrolyzed (2-Phenylimino-3-indolinone) and obtained (E) -2 – (3-oxobenzo thiophen-2 (3H) – ylidene) benzo thiophen-3 (2H)-one aniline (GP 119280) (d)In the presence of sodium hydroxide, 2-Nitrobenzaldehyde reacted with acetone (e) of sodium hydroxide (o-Nitrophenylpropiolic acid) of the thermal transition of (E) -2 -(3-oxobenzo thiophen-2 (3H) – ylidene) benzo thiophen-3 (2H)-one aniline, then use the glucose reduction. (A) of potassium hydroxide, sodium hydroxide, presence of a mixture of sodium cyanide, N- phenyl glycine and sodium amide (or sodium and ammonia flow ) melting transition indoxyl is false, then oxidized with air indolenine phenol (b) the alkali-soluble so that 2-(Carboxymethylamino)benzoic acid into 3-hydroxy-2-indole acid, and then using air oxidation in alkaline solution (C) with a cyanide potassium and lead carbonate in aqueous – alcoholic solution treatment 1,3-Diphenylthiourea, then by the action of ammonium sulfide generated by changes in α- cyano -N, N’- diphenyl formamidine 2 – anilino -α – ( benzylidene amino) thioacetamide, and then with hot concentrated sulfuric acid, converted to 2-Phenylimino-3-indolinone ( (E) -2 – (3-oxobenzo thiophen-2 (3H) – ylidene) benzo thiophen-3 (2H)-one aniline ), isolated as the hydrochloride ( or bisulfite compound), and finally with vulcanized directly into Indigo. Manufacturing Methods : commonly known as Indigo.
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