Ponceau S is used to prepare a stain for rapid reversible detection of protein bands on nitrocellulose or polyvinylidene fluoride membranes, as well as on cellulose acetate membranes. And it is also used as a rapid protein band stain.
Schmitz, N.; Laverty, S.; Kraus, V.B.; Aigner, T. Basic methods in histopathology of joint tissues. Osteoarthritis and Cartilage. 2010, 18, (3), S113-S116.