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Orange II sodium salt (C.I. 15510), 5 g

for microscopy
Pack Qty.
Pack.
Acid orange 7
Empirical formula C16H11N2NaO4S
Molar mass (M) 350,33 g/mol
Density (D) 1,525 g/cm³
Melting point (mp) 164 °C
WGK 1
CAS No. [633-96-5]
EG-Nr. 211-199-0

Indicator pH 7,4-8,6 and pH 10,2-11,8
Dissolve 0.1 g in 100 ml of water

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

CHF19.50/Pack Qty. 

excl. VAT. | 5 g per Pack Qty.

Art. No. 7729.1

Available at short notice
Free of shipping costs from 200 CHF
from 6 Pack Qty. CHF18.52/Pack Qty.
from 24 Pack Qty. CHF17.55/Pack Qty.
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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 
Handling area 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 CHF19.50
7729.2 25 g glass CHF34.90
7729.3 100 g glass CHF83.30
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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.


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

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

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