2.4.3. pH
Silk fabrics were dyed in 50% owf. of the mangrove bark extractdye solution in dyebaths at different pH values of 3, 5, 7, 9, and 11, ata liquor ratio of 1:40, at 90◦C for 60 min. The pH of the dyebaths wasadjusted to a desired value with acetic acid and sodium carbonatesolution.