The BBL BD DrySlide indole test is a qualitative procedure for determining the ability of bacteria to produce indole by reductive deamination of tryptophan..Vracko and Sherris showed that the BBL BD DrySlide indole test can be performed using filter paper moistened with p-dimethylaminobenzaldehyde (DMABA), an effective indicator of indole production. BBL BD DrySlide Indole discounts available for Government, Universities and resale orders.