Attention:

Certain features of Sigma-Aldrich.com will be down for maintenance the evening of Friday August 18th starting at 8:00 pm CDT until Saturday August 19th at 12:01 pm CDT.   Please note that you still have telephone and email access to our local offices. We apologize for any inconvenience.

Stains and Dyes

Sigma-Aldrich offers one of the largest selections of stains and dyes in the world. Fifty-five of the dyes are independently tested for biological and medical performance criteria and certified by the Biological Stain Commission (BSC). In addition to BSC certified stains and dyes such as Alcian Blue, Basic Fuchsin, Congo Red, Crystal Violet and Oil Red O, just to name a few, Sigma-Aldrich manufactures hundreds of stain and dye products used across many industries and for a large variety of applications. Such uses include Ponceau S and Coomassie Blue for electrophoresis, Hematoxylin, Giemsa and Wright stains for microscopy, Fluorescein Isothiocyanate and Rhodamine B for fluorescent dyes, Phenolphthalein for pH indicators and Propidium Iodide and SYBR Green for nucleic acid detection and protein sequencing applications.