Bromthymol-blue Lactose Sucrose Agar (BLS Agar)
Salmonella grown on Bromthymol-blue Lactose Sucrose Agar. Salmonella does not ferment lactose or sucrose and therefore produces blue colonies.		Escherichia coli grown on Bromthymol-blue Lactose Sucrose Agar. E. coli ferments lactose and/or sucrose and therefore produces yellow colonies.
This medium is used to separate lactose- and/or sucrose-positive bacteria from lactose- and sucrose-negative bacteria.