Osorno Enterprises

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Congo Red


Congo Red is a pH indicator dye, with a vibrant blue-red transition between pH 3 and 5. While it has largely been replaced by other pH indicators for general use, it still finds use as a hisology and microscopy stain.

For indicating other pH values, please look through our Indicators page.

We sell congo red as a 0.1% solution in water in various sizes – please contact us to customize your order!

Additional information

CAS Number


Indicator Type


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Osorno Enterprises Inc.
976 Elgin Avenue
Winnipeg MB R3E 1B4
+1 204 488-1538 (Phone)
+1 204 488-1566 (Fax)
Regular Hours of Operation
We are closed on December 24 - 28, 2020 and
December 31, 2020 - January 4, 2021
Monday - Friday: 9:00 - 17:00
Saturday - Sunday: Closed

© Osorno Enterprises Inc.