Ponceau S solution (500 ml)

0.1% (w/v) PONCEAU S in 5% acetic acid. Prepared in 18.2 megohms water and filtered through 1-micron filter. COMPOSITION Ponceau S (CAS 6226-79-5); MW: 760.57; Concentration: 0.10% Acetic Acid, Glacial (CAS 64-19-7); MW: 60.05; Concentration: 5% Water (CAS: 7732-18-5); MW: 18.02