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Congo Red Indicator Pure [ CAS: 573-58-0 ] - 25g
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Description
Congo Red
Other Names: Direct Red 28, C.I. 22120
Chemical Name: Benzidinediazo-bis-1-naphthylamine-4-sulfonic acid, disodium salt
Chemical Formula: C₃₂H₂₂N₆Na₂O₆S₂
Molar Mass: 696.66 g/mol
CAS Number: 573-58-0
EC Number: 209-358-4
Appearance: Reddish-brown to dark violet powder
Physical and Chemical Properties
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Solubility: Soluble in water (intense red solution); slightly soluble in ethanol
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Melting Point: Decomposes before melting
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pH Range (Indicator): pH 3.0 (blue-violet) to pH 5.0 (red)
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Odor: Odorless
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Stability: Stable under recommended conditions; light-sensitive
Applications
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pH Indicator: Used as a pH indicator in titrations and buffer solutions (acid–base range: 3.0–5.0)
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Microscopy and Histology: Employed in biological staining procedures, including amyloid staining
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Textile and Dye Chemistry: Investigated for interactions with fibers and in dyeing research
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Analytical Chemistry: Used in adsorption, complexation, and surface chemistry experiments
Safety Information
Signal Word: ⚠️ Warning
H350: May cause cancer [Danger Carcinogenicity]
H361d ***: Suspected of damaging the unborn child [Warning Reproductive toxicity]
P203, P280, P318, P405, and P501
Handling and Storage
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Handling: Avoid inhalation and contact with skin or eyes. Handle in a fume hood or well-ventilated area
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Storage: Store in tightly sealed containers in a cool, dry, well-ventilated place away from light and incompatible substances