The small particles bind into the fatty/oily parts of the fingerprint residues due to addition of the surfactant; This is often only feasible a result of the relative balance of such parts preserved after some time. Hence, aged fingerprints may be made by using the small particle reagent approach. In https://raymondqwyyy.theideasblog.com/27297877/helping-the-others-realize-the-advantages-of-hodgdon-varget-smokeless-gun-powder