Preparation
2-Hydroxy-3-methylbenzoic acid with the 2,6-Dichloro-3-nitrobenzaldehyde?condensation, the product oxidation and changed into sodium salt.
Properties and Applications
brilliant green blue. Soluble in water for brown light yellow, slightly soluble in alcohol. In concentrated sulfuric acid to blue light red, red precipitation after dilution. Dye aqueous solution to join sodium hydroxide as 3H-indol-3-one,2-(1,3-dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro- blue.
Standard(cotton)
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Ironing Fastness
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Light Fastness
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Fulling
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Persperation Fastness
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Soaping
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Water
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Alkali
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Acid
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ISO
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3
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4
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