ABSTRACT This study investigated the biosorption of the anionic textile dyes: Reactive Red 239 (RR239). Reactive Black B (RBB) and Direct Blue 85 (DB85) according to pH. biomass dosage. contact time and dye concentration onto waste beer yeast slurry. https://www.markbroyard.com/flash-pick-weleda-skin-food-75ml-online-sale-flash-save/