CRESOL RED, FREE ACID Grade:ANALYTICAL GRADE CAS Number: 1733-12-6Synonym(s): o-Cresolsulfonphthalein Molecular Weight: 382.43Molecular Formula: C21H18O5S Storage Condition: ROOM TEMPERATURE CodeSizePriceQuantity 0436-5G 0436-25G A pH indicator (Orange to Yellow; range 0.2 – 1.8 and Yellow to Violet; range 7.0 – 8.8). Also used as a constituent of PCR reagent systems. Color Index: N/A