Date published: 2026-2-6

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Acid yellow 40 (CAS 6372-96-9)

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Alternate Names:
C.I. 18950; Polar Yellow
CAS Number:
6372-96-9
Molecular Weight:
584.98
Molecular Formula:
C23H18ClN4O7S2•Na
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

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Acid yellow 40 is a synthetic dye from the azo dye family, renowned for its widespread laboratory applications. As a yellowish-green dye, it exhibits excellent solubility in water, maintaining a stable pH range of 6.5-7.5, while resisting degradation from light and air exposure. Its versatility in histology, microscopy, staining procedures, and other laboratory techniques makes it highly sought after. In laboratory applications, acid yellow 40 is effectively employed to distinguish and classify various cell types, tissues, and organs.

Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

Acid yellow 40, 10 g

sc-291830
10 g
$122.00