GSP Chemical Industries

P-Xylenol Blue

P-Xylenol Blue
Business Type Manufacturer, Supplier
C.A.S. No. 125-31-5
M.F. C23H22O5S
M.W. 410.49gm/mole
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Preferred Buyer From

Location Anywhere in India

Product Details

Dye Content (by Spectrophotometry)
Solubility 0.1 % (MeOH)
Clear solution
Transition range
pH 8.0-9.6 Yellow-Blue
Absorption maximum (in MeOH) ?max
Absorptivity (A1%/1cm, in MeOH)
Loss on drying (110°C)

Chemical Name

4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis(2,5-dimethylphenol) S,S-dioxide


InChI Key




Soluble in acetone, alcohol, and dilute aqueous alkali. Sparingly soluble in water.


Xylenol Blue is a dark brown powder and it belongs to the class of sulfonephthalein dyes. Xylenol Blue changes color from red (pH 1.2) to yellow (2.8) and yellow (8.0) to blue (9.6). It is widely used in food storage, drugs, determining bacterial growth, microbial assays and determining lipase.



Xylenol Blue is a useful alternative to thymol blue developed in the 1920s. Xylenol Blue can be used at half the concentration that thymol blue requires. It is functional at the same two pH ranges, acidic (pH 1-3), which transitions from red to yellow, and basic (pH 8-10), which transitions from yellow to blue. Used in electrochromic displays, chemical sensors, fiber-optic pH sensors, optical quality films, ink, corrosion testing, lubricants, TTI indicators, food storage, cosmetics, bacterial growth, microbiological assays, determining lipase, drugs.

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