Small particle reagent based on natural dyes for developing latent fingerprints on non-porous wet surfaces

The latent fingerprint may be found on items which have been accidentally or deliberately wetted. One of the most effective application techniques for developing latent prints on wet non-porous surfaces is small particle reagent (SPR). SPR based on zinc carbonate and mixed with natural dyes (curcumin and anthocyanin) and commercial liquid detergent. Immersed the latent fingerprints into clean water and dirty water for 30 days, i.e. stainless, mirror and plastic slide. Three surfaces were taken out and sprayed with SPR formulations everyday. In the present experimental study the best results were given by stainless surface followed by glass and plastic, respectively.