With respect to the use of white particles, no moderate or better quality images were obtained, only poor partial images. Within this the best quality was obtained from SPR VI with a ratio of zinc carbonate and tergitol NP-7 of 12.5 (Table 2). Moreover, SPR VI was quite effective at developing latent fingerprints on metal surfaces (Table 1). Poor results were obtained from SPR IV, V, VIII, IX, X and XI, with average ridge counts on every type of surfaces of between 0.35 and 1.75 (Table1). The soaking solvents such as tap water, acid, base and salt solutions did not affect the effectiveness of SPR suspension; but a high salt [50% and 70% (w/v)] concentration affected the fingerprint impression.
With respect to the use of white particles, no moderate or better quality images were obtained, only poor partial images. Within this the best quality was obtained from SPR VI with a ratio of zinc carbonate and tergitol NP-7 of 12.5 (Table 2). Moreover, SPR VI was quite effective at developing latent fingerprints on metal surfaces (Table 1). Poor results were obtained from SPR IV, V, VIII, IX, X and XI, with average ridge counts on every type of surfaces of between 0.35 and 1.75 (Table1). The soaking solvents such as tap water, acid, base and salt solutions did not affect the effectiveness of SPR suspension; but a high salt [50% and 70% (w/v)] concentration affected the fingerprint impression.
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