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Azure B (C.I. 52010), 100 g

for microscopy
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Azure I, N,N,N'-Trimethylthionin
Empirical formula C15H16ClN3S
Molar mass (M) 305,83 g/mol
Melting point (mp) 205 °C
WGK 1
CAS No. 531-55-5
EG-Nr. 208-511-2


Azure B belongs to the basic coal tar dyes (methylene blue and its derivatives). These dyes are mainly used for staining of blood elements. In watery solution they form special salts with the acid eosin, the eosinates.
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€103.75/Pack Qty. 

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Art. No. 7637.3

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Azure B (C.I. 52010) for microscopy

Azure B belongs to the basic coal tar dyes (methylene blue and its derivatives). These dyes are mainly used for staining of blood elements. In watery solution they form special salts with the acid eosin, the eosinates.


Besides eosin and methylene blue Azure B is the main component of Giemsa staining solution (Art. No. T862). The Azure B eosinates in the solution cause the so called “Romanowsky-Giemsa effect”, a polychromatic, pH-dependent staining of chromatin.



Azure B (C.I. 52010)
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7637.1 5 g glass

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7637.2 25 g glass

€37.55

7637.3 100 g glass

€103.75

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Certificates of Analysis

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The following analysis certificates have been found:

Type analysis

Appearancedark green to green black powder
Appearance of solution (0,1 % in H2O)clear, blue
Loss on drying (1 h, 110 °C)≤8,0 %