International Shipping

We do not offer international shipping to countries within the European Union

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

Bromocresol Purple Free Acid

Price: £8.95
Stock Availability:

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Stock Availability
On Shelf - Approx. UK delivery date: Wednesday the 01st October 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 Stain
  • pH Indicator



Bromocresol purple (BCP) or 5',5"-dibromo-o-cresolsulfophthalein, is a pH indicator. In its sultone form, it has a pKa value of 6.3,[1] and is usually prepared as a 0.04% aqueous solution.



  • Minimum Assay: 90%
  • Molecular Formula: C21H16Br2O5S
  • Molecular Weight: 540.22 g/mol
  • Melting Point: 240°C

Visual Transition Interval:

From pH 5.2 (Yellow)

To pH 6.8 (Purple)

Hazard Phrases: Not considered harmful under normal laboratory conditions

Cas No: 115-40-2
Einecs No: 204-087-8

Payment Methods

We can also accept a bank transfer (UK Only)

Source Chemicals Ltd