Luminol, Bluestar: Training Version Bluestar Training has a stronger and longer-lasting luminescence that does not require total darkness to be visible. Good quality pictures can be obtained with an ordinary camera and film. Bluestar Training works as well on fresh blood as on very old or altered bloodstains, pure or diluted Bluestar Training is easier and safer to prepare. Neither powders nor liquids to be mixed, but only fast-dissolving tablets. Bluestar Training can be sprayed over and over again on the same bloodstains for the same resulting luminescence each time. The extreme sensitivity of Bluestar Training allows the naked eye to detect bloodstains down to 1/1000 dilutions, like minute traces or droplets that have been washed off, with or without detergent.