CONCLUSIONS
The quality of SPR formula was determined by the type and proportion of particles and detergent, and their ratio as well as the pH
With respect to the use of dark particles, the best quality of developed latent print on wet non- porous surfaces was obtained from SPR II, which contained molybdenum disulfide, tergitol NP-7 and choline chloride at a pH of 3.1. Poor results were obtained from all SPR compositions containing white particles.