Lightning® Bi-Chromatic™ Powder has the remarkable properties of appearing black when dusted on a light-colored surface and silver when dusted on dark-colored surfaces. Using a Zephyr® Fiberglass Brush and Bi-Chromatic™ Powder, you can dust up to 90 percent of the surfaces found at most crime scenes. The greatest advantage of using Bi-Chromatic™ Powder is that the lifted prints will be black when placed on a white backing card. This eliminates the bother of comparing latent prints with light-colored ridges on a black background against rolled prints with black ridges on a white background. It also means that only white backing cards will be needed.