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We can only ship non-hazardous products to Rest of World

Methyl Blue (Cotton Blue) C.I. 42780

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Price: £16.95

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Stock Availability

On Shelf - Approx. UK delivery date: Wednesday the 25th February 2026*

In bulk stock - ships within 10 - 12 Working Days (Excluding weekends and public holidays)

4 to 6 weeks approx. (Not guaranteed)

UK Shipping

Unfortunately, we are not currently accepting orders for Northern Ireland, Jersey and Guernsey.

We can only ship to the following postcodes where a Royal Mail postal option has been chosen at checkout.

AB, DD, DG3, DG4, DG6 - DG9, EH, FK, G, HS, IM, IV, KA, KW, KY, ML, PA, PH, PO30 - PO41, TD, TR21 - TR25, ZE

* We will always try to ship as early as possible. Delivery could be much quicker than stated but is not guaranteed

Applications

Used as a counterstain

General

Methyl Blue, also known as Cotton blue, acid blue 93 and china blue and is commonly used as a counterstain in the martius scarlet blue and masson trichrome staining methods

Specification

C.I.42780
Minimum Assay: 96%
Molecular Formula : C37H27N3Na2O9S3
Molecular Weight : 799.80 g/mol
Melting Point: 137 °C
Absorption max: 600 nm
Visual transition: pH 10.0 (blue) to pH 13.0 (orange)

Hazards

Hazard Phrases: Harmful if swallowed.

Prec Phrases: Avoid breathing dust/fume/gas/mist/vapours/spray. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Harmful CLP Image