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Orange II sodium salt (C.I. 15510), 25 g

for microscopy
Pack Qty.
Acid orange 7
Empirical formula C16H11N2NaO4S
Molar mass (M) 350,33 g/mol
Melting point (mp) 164 °C
CAS No. [633-96-5]
EG-Nr. 211-199-0

Indicator pH 7,4-8,6 and pH 10,2-11,8
Water-soluble dye

Water-soluble dye, is used in cytology, e.g. as ingredient of Papanicolaou solution 2b.
Product details
Type analysis

€25.70/Pack Qty. 

excl. VAT. | 25 g per Pack Qty.

Art. No. 7729.2

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Product details

Orange II sodium salt (C.I. 15510) for microscopy

Water-soluble dye, is used in cytology, e.g. as ingredient of Papanicolaou solution 2b.

Technical Information
Colour conversion amber - orange  
orange - red  
Transition range pH 7,4 – 8,6  
10,2 – 11,8  
Orange II sodium salt (C.I. 15510)
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Order No. Pack Qty. Pack. Price Quantity
7729.1 5 g glass €14.55
7729.2 25 g glass €25.70
7729.3 100 g glass €61.20
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General information

Indicators and Dyes

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

Analysis certificates

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

Appearanceorange to brown powder
pH-transition range7,4 (amber)-8,6 (orange)
pH-transition range10,2 (orange)-11,8 (red)

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