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A note to our European Union customers
International shipping is currently disabled due to ongoing issues resulting from Brexit and changes with customs procedures. Please note, once resumed, international shipments will be subject to VAT and duties and orders can only be placed in acceptance of this.

Northern Ireland
We will only be able to ship to Northern Ireland where a Royal Mail postal option has been chosen.

Other UK orders are unaffected

Indigo Carmine ACS/USP C.I. 73015

Indigo Carmine ACS/USP C.I. 73015

Price: £9.17

Stock Availability:

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Stock Availability
On Shelf - Approx. UK delivery date: Tuesday the 27th May 2025*
In bulk stock - ships within 4 - 8 Days (Excluding weekends and public holidays)
4 - 6 Weeks Approx.
* We will always try to ship as early as possible
  • Biological Dye

Indigo Carmine is a dark blue to purple powder. The primary use is as a pH indicator. It is blue at pH 11.4 and yellow at 13.0. Indigo carmine is also a redox indicator, turning yellow upon reduction.

  • C.I.73015
  • Minimum Assay: >80%
  • Molecular Formula C16H8N2Na2O8S2
  • Molecular Weight 466.36 g/mol
  • Loss on drying:  5.0% maximum
  • Visual Transition Interval: From pH 11.5 (Blue) To pH 14.0 (yellow)
  • Aqueous solubility: 1 g in 100 ml at 25 Deg. C
  • Subsidiary dyes, excluding disodium
  • 3,3-dioxo 2,2’-bi-indolylidine-5,7’-disulfonate:  1.00% maximum
  • Dye intermediates: < 0.50%
  • Lead: <0.001%
  • Sulfur: 13.0 – 14.0%

Hazard Phrases: Harmful if swallowed.

Harmful CLP Image

Cas No: 860-22-0
Einecs No: 212-728-8

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