The small particles bind to your fatty/oily components of your fingerprint residues because of the addition of the surfactant; This is certainly only possible mainly because of the relative steadiness of those components managed after some time. Hence, aged fingerprints may be produced by using the small particle reagent system. https://www.tumblr.com/business-sites/749272769121910784/imr-green-smokeless-gun-powder?source=share