Date published: 2025-12-18

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o-Cresolphthalexon (CAS 2411-89-4)

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Alternate Names:
Phthalein purple
Application:
o-Cresolphthalexon is an alkaline earth metal indicator
CAS Number:
2411-89-4
Molecular Weight:
636.60
Molecular Formula:
C32H32N2O12
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

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o-Cresolphthalexon, also known as Phthalein purple, is a coloring agent used as an alkaline earth metal ion indicator. Suggested to be colorless at pH 11, but turns pink in the presence of alkaline earth metals. Also utilized in an autoanalyzer to determine serum calcium.

Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

o-Cresolphthalexon, 1 g

sc-215602
1 g
$32.00

o-Cresolphthalexon, 5 g

sc-215602A
5 g
$101.00