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Alkali blue 6B (C.I. 42765), 10 g

Pack Qty.
Alkali blue
Empirical formula C37H29N3O3S
Molar mass (M) 595,72 g/mol
Melting point (mp) >300 °C
CAS No. [1324-76-1]
EG-Nr. 215-385-2

Indicator pH 9.4-14.0
Dissolve 0.1 g in 100 ml water

Type analysis

€21.50/Pack Qty. 

excl. VAT. | 10 g per Pack Qty.

Art. No. 5155.1

In stock
Free of shipping costs from 125 €
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from 6 Pack Qty. €20.42/Pack Qty.
from 24 Pack Qty. €19.35/Pack Qty.
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Personal technical advice on this product
Dr Deck
Dr Deck
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Product details

Alkali blue 6B (C.I. 42765) p.a.

Technical Information
Colour conversion blue - red 
Handling area pH 9,4 - 14,0 
Alkali blue 6B (C.I. 42765)
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Order No. Pack Qty. Pack. Price Quantity
5155.1 10 g glass €21.50
5155.2 25 g glass €41.50
5155.3 100 g glass €120.50
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General information

Analysis of Food

Carl ROTH also offers reagents suitable for food analysis.

On the following pages, you will find the determination of
• Nitrogen according to Kjeldahl
• Sugar
• Mercury
• Trichinae
• Fat

and the determination of the
• Iodine value
• Acid value
• Peroxide value
• Saponification value

as well as other determining factors such as
• Viscosity
• Density
• Hydroxyl value
• Fluoride ions

Saponification Value

The saponification value denotes the amount of potassium hydroxide required to neutralise free fatty acids and saponify bound fatty acids. The lower the average molar mass of the fat, the higher the saponification value. The sample is heated under reflux in a defined quantity of ethanolic potassium hydroxide solution and the non-used alkaline solution is titrated with hydrochloric acid.

Indicators and Dyes

Carl ROTH offers many indicators and dyes of high purity, which can be used in special applications.

Hydroxyl Value

The hydroxyl value is a measure of the hydroxy group content of organic materials such as paints, resins, polystyrenes, solvents and lipids. It represents the amount in milligrams of potassium hydroxide required to neutralise the quantity of acetic acid that combines on acetylation of one gram of the substance being tested.

Acid Value Determination

The acid number characterises the acidic components of the fats. For this purpose, the sample is dissolved in a solvent and titrated against phenolphthalein with potassium hydroxide solution. Only free fatty acids are recorded. The fatty acids bound in the glycerides are not determined.

Certificates of Analysis

You can search for and download your certificate of analysis for the selected product here. Please provide your batch number.
The following analysis certificates have been found:

Type analysis

AppearanceBrownish black powder  
Appearance of solution (0,1 % in H2O)Dark blue solution  
Loss on drying (1 h, 110 °C)≤6 %  
Transition range9.4 (blue)-14.0 (red)  

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