This reagent is used to enhance patent (visible) ridge detail or other patterns found on relatively smooth dark surfaces.  The reagent is a suspension of Titanium Dioxide in a carrier liquid.  The most common use for this reagent at scenes is for the enhancement of patterns of dried blood.  Enhancement occurs through the adherence of Titanium Dioxide to blood (and potentially other materials) stuck to the smooth surface.  The white color of the Titanium Dioxide makes it appropriate for enhancement of patterns observed on relatively smooth dark surfaces, where it provides additional contrast. The methanol-based solution is preferred when the surface in question is suitable.

The images below show fingerprints in blood on a black floppy disc and the results of enhancement using Titanium Dioxide.