Wool fast blue

The above sulfonic acids are important starting materials for preparing azo and other dyes (wool fast blue BL). 8... 

The spectrophotometric determination of the following antibiotics has been performed based on the reactivity with iodine ampicillin, penicillin V, amoxycillin, cloxacillin, cefadroxil, ceftezoxime, grise-ofulvin, streptomycin, nicoumalone, and acebutolol hydrochloride. An excess of iodine of known concentration is added to the drug alkaline solution and the unreacted iodine monitored through the decrease in the absorbance of the dye wool fast blue at 540 nm. The determination of pentoxifylline is also based on adding a known excess of standard iodine solution under alkaline conditions and the excess of iodine determined at pH 3.0 with metol-isoniazid (620 nm) or also with wool fast blue (540 nm). 

Strictly, the name Wool fast blue BL applies to the sodium salt. 

Wool fast blue BL Na salt, in W-00002 Xylenol blue, X-00005... 

Milling dyes with very good wet fastness are obtained by the reaction of one mole of a diamine with two moles of bromamine acid, as in the case of Cl Acid Blue 127 (6.35). This dye is suitable for dyeing wool bright blue from a neutral or weakly acid bath. 

Synthesis of the copper complex31 [167780-70-3] (H, Na salt) involves coupling of a diazonium compound with a hydrazone [54] 2-(3-amino-4-hydroxyphe-nylsulfonamido)chlorobenzene is dissolved in hot water, to which dilute NaOH solution is then added. After addition of sodium nitrite, the solution is cooled to -5 °C and then added to a well-stirred mixture of HC1, water, and ice. The diazonium salt suspension is neutralized with NaHC03 and combined with the weakly acidic solution of the hydrazone formed with 2-hydrazino-5-sulfobenzoic acid and benzaldehyde in water. The reaction mixture is kept at 0-10 °C, and at pH 10-12 by dropwise addition of diluted NaOH. When the coupling is complete, the pH of the formazan solution is reduced to 8 with HC1, a dilute aqueous solution of copper tetraaminosulfate is added and the solution is stirred for several hours. The copper complex 31 is precipitated at 85-90 °C with NaCl, then filtered and dried. The resulting powder colors wool in clear, fast blue tones. 

Other Names C.I. Acid Blue 89, trisodium salt Acid Blue Sh Acid Light Blue Acid Sky Blue Acilan Fast Navy Blue B Atul Acid Sulfon Blue B C.I. 13405 C.I. Acid Blue 89 Calcocid Wool Blue B Cirene Brilliant Blue B Eniacid Brilliant Blue B Fast Wool Blue B Hispacid Fast Blue B Russian Acid Blue Sulfonine Acid Blue B Sulphon Acid Blue B Tertracid Fast Flue SB CA Index Name 2,7-Naphtlialenedisulfonic acid, 4-hydroxy-5-[[4-[(4-methylphenyl)amino]-5-sulfo-l-naphthalenyl]azo]-, trisodium salt CAS Registry Number 10359-95-2 Merck Index Number Not listed Chemical Structure... 

Premetallized Dyes. Although discovered in 1912, the 1 1 chromium complexes known as Palatine Fast (BASF) and Neolan (Ciba) dyes had httie practical use as wool dyes until 1920 when it was found that a strongly acidic dyebath (pH ca 2.0) (51) was requited to obtain satisfactory dyeing and acceptable fastness properties. Dyes of this type exemplified by Neolan Blue 2G [6370-12-3] (57) (Cl Acid Blue 158A Cl 15050) are stiU in use despite the damage to the wool caused by the strong acid in the dyebath. 

Acid—mordant dyes have characteristics similar to those of acid dyes which have a relatively low molecular weight, anionic substituents, and an affinity to polyamide fibers and mordant dyes. In general, brilliant shades caimot be obtained by acid—mordant dyes because they are used as their chromium mordant by treatment with dichromate in the course of the dyeing procedure. However, because of their excellent fastness for light and wet treatment, they are predominandy used to dye wool in heavy shades (navy blue, brown, and black). In terms of chemical constitution, most of the acid—mordant dyes are azo dyes some are triphenyhnethane dyes and very few anthraquinone dyes are used in this area. Cl Mordant Black 13 [1324-21 -6] (183) (Cl 63615) is one of the few examples of currentiy produced anthraquinone acid—mordant dyes. It is prepared by condensation of purpurin with aniline in the presence of boric acid, followed by sulfonation and finally by conversion to the sodium salt (146,147). 

Fastness to Light. The ISO test for colorfastness to light is DajlightlSO 105-B01. The textile specimen is exposed to daylight under prescribed conditions, including protection from rain, along with a series of blue wool reference samples that fade at defined, prescribed, different rates. 

In 1871 Graebe and Liebermann discovered that alizarin (6.2) could be applied to wool by mordant dyeing after sulphonation to produce the 3-sulphonic acid (6.28). This dye is still listed in the latest revision of the Colour Index as a commercial product [11]. Although many sulphonated polyhydroxyanthraquinones have been examined, few remain in current use. Another, and more important, classic dye that continues in commercial use as an acid dye is Cl Acid Blue 45 (6.29). This dye was discovered in 1897 by Schmidt and can be made from anthrarufin (6.13) by disulphonation, subsequent dinitration and reduction. The dye gives an attractive blue on wool with good all-round fastness properties. 

The progressive introduction of methyl groups into the pendant phenyl ring of Cl Acid Blue 25 (6.30 R = H) leads to an increase in dye uptake and to improved wet fastness properties on wool [12]. Steric crowding in the case of Cl Acid Blue 129 (6.33) reduces the conjugation of the 4-substituent with the remainder of the system and results in a reddish blue hue. The aliphatic cyclohexyl ring in Cl Acid Blue 62 (6.31) has a similar effect on the hue. 

The mordant dyes are preferred for deep colors in black, navy blue, and brown shades. They represent because of their economy and high fastness to the present day the most important dye class for dyeing wool, with a market share of more as 35 % [9],... 

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