This product has two applications: for blowing latent powder onto an area to develop a print and to blow off excess powder from a developed print before actually lifting the print.

When used for developing a print, simply remove the aluminum cap and pour a small amount of latent powder into the cap, then reinsert the cap into the rubber bulb. Squeeze the bulb to blow the powder on the suspected area to develop the print.

If used as a tool for removing excess powder from a developed print, simply squeeze the bulb and blow away any excess powder. Not recommended for magnetic powders.