The small particles bind to the fatty/oily components of the fingerprint residues a result of the addition of a surfactant; This can be only feasible because of the relative steadiness of those components preserved after a while. Thus, aged fingerprints might be made by utilizing the small particle reagent process. https://www.tumblr.com/business-sites/749272769121910784/imr-green-smokeless-gun-powder?source=share