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EASY-TO-READ RESULTS: the yellow reagent will gradually turn orange and then to light purple when E.Coli or other fecal coliform bacteria is present in water, according to the color chart included

Takeaways Bacteriostatic water contains 0.9% benzyl alcohol preservative enabling multi-dose use for up to 28 days Sterile water provides maximum purity but requires single-use within 24-48 hours after opening Cell culture applications typically require sterile water due to benzyl alcohol cytotoxicity concerns Choice depends on experimental timeline, peptide sensitivity, and whether preservatives interfere with assays What is Bacteriostatic Water for Peptides