A mixed population of Bacillus cereus and Pseudomonas aeruginosa stained with the dye mixture provided in our LIVE BacLight™ Gram Stain Kit (Cat. No. L7005). When live bacteria are incubated with this kit's cell-permeant nucleic acid stains, gram-positive organisms fluoresce orange and gram-negative organisms fluoresce green. The bacteria were photographed through an Omega Optical triple bandpass filter set.