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Orange II sodium salt (C.I. 15510), 100 g

for microscopy
Icon_EVE-EUD Please consider that this product might be liable to some legal sanctions as for example to obtain an end user declaration or the prohibition of some applications. For details please do contact your counterpart in our sales department!
Examples of effect: Have an allergenic effect, carcinogenic, mutagenic, toxic to reproduction and cause developmental toxicity (reprotoxic) or damage to organs Safety: You must be well-informed before starting work with these substances; wear protective clothing and gloves, eye protection and mask or breathing protection.
i causes damage to organs through prolonged or repeated exposure, harmful to aquatic life with long lasting effects
P260 P273 P314
i do not breathe dust, avoid release to the environment, get medical advice/attention if you feel unwell
Pack Qty.
Acid orange 7
Empirical formula C16H11N2NaO4S
Molar mass (M) 350,33 g/mol
Density (D) 1,53 g/cm³
Melting point (mp) 290 °C
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

€71.95/Pack Qty. 

excl. VAT. | 100 g per Pack Qty.

Art. No. 7729.3

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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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Art. No. Pack Qty. Pack. Price Quantity
7729.1 5 g glass


7729.2 25 g glass


7729.3 100 g glass


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Downloads / MSDS

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)