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Neutral Red Indicator C.I. 50040

Price: £6.95
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Stock Availability
On Shelf - Approx. UK delivery date: Thursday the 18th September 2025*
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.

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
  •  Biological Dye
  • pH Indicator

Neutral Red stains lysosomes red. It is used as a general stain in histology, as a counterstain in combination with other dyes, and for many staining methods. Together with Janus Green B it is used to stain embryonal tissues and supravital staining of blood. Can be used for staining Golgi apparatus in cells and Nissl granules in neurons. It can be used to stain cell cultures for plate titration of viruses. Neutral Red can also be added to some growth media for bacteria and cell cultures. This dye also acts as a pH indicator, changing from red to yellow between the pH 6.8-8.0.

  • C.I.50040
  • Minimum Assay: >65%
  • Molecular Formula: C15H17ClN4
  • Molecular Weight: 288.78 g/mol
  • Melting Point: 290 °C
  • Absorption Wavelength: 539nm
  • Specific Absorbtion: 6.70
  • Loss on Drying: <8.65%
  • Colour Transition: pH 6.8 (Red) -pH 8.0 (Yellow)

Hazard Phrases: Not considered harmful under normal laboratory conditions

Cas No: 553-24-2
Einecs No: 209-035-8

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Source Chemicals Ltd