Malachite Green Oxalate Crystals C.I. 42000


Malachite Green Oxalate is often used as a counterstain in histological tissue sections and for staining bacterial polysaccharides and spores. Commonly used as a counter stain in the Ziehl-Neelsen procedure.

  • Parasiticide
  • Blue-green counterstain
  • Biological Drye Dye
  • Stain Manufacture

Colour Index: C.I. 42000
Molecular Formula: C52H54N4O12 
Molecular Weight: 927.02
Wavelength of Maximum Absorption, λ Max (in 50:50 IMS:Water): 623nm
Absorption Ratio (A λ max-15nm/A λmax+15nm): 1.01
Specific Absorption (A 1% in 10nm Cell) AT, λmax: 1814
Maximum Loss on Drying at 105 deg C: 10%
Synonyms: Basic Green 4

Hazard Class: 6.1

Packing Group: 3

Hazard Phrases: Toxic if swallowed. Causes serious eye damage. Very toxic to aquatic life with long lasting effects.

Prec Phrases: Avoid release to the environment. Wear protective gloves/protective clothing/eye protection/face protection. IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Dispose of contents/container.


Cas No: 2437-29-8
Einecs No: 219-441-7

HS CODE: 32129000


Following the UK’s departure from the EU on 1 January 2021, all European shipments are sent on a DAP Basis (Delivered at Place).

This means that the buyer will be liable for import VAT at their prevailing national rate and for orders over 150€ (including carriage) import duties will become chargeable at your prevailing national rate.

The Duty is ascertained by your national customs authority based on the HS Code of each product. The HS Code is shown in the “European Shipment” section of each product page.


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