Ponceau S

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Description Ponceau S: Ponceau S is the sodium salt of a diazo dye. It is used to make a stain for rapid reversible staining of protein bands on nitrocellulose or PVDF membranes (W estern blots) and also for staining protein on cellulose acetate membranes. The stain is reversed with water washes and aids in subsequent immunological detection. Specification Grade Indicator Formula C22H12N4Na4O13S4 MW 760.61 CAS 6226-79-5 Appearance Red-brown to dark-brown Powder Identification To pass test Lambda max. ~520 (352) nm in water Dye content >80% Loss on drying Show more