Seven brands of black and magnetic powders available in Thailand were used toinvestigate the number of minutiae of developed latent fingerprint on 12 surface samples byAutomated Fingerprint Identification System (AFIS). Each brand was repeated 10 times on eachsurface. The average numbers of minutiae of each brand was compared to those on inked print(52), and then calculate as percentage. The efficiency of powders on each surface was gradedaccording to the percentage: >80% = excellent, 66-80% = good, 50-65% = fair, and <50% =poor. Magnetic powder and 3 brands of black powder (Silver Arrow, BVDA and Siam Smart)were scored excellent on every surface, whereas the efficiency of the others varied on differentsurfaces. CD cassette plastic box was the only surface that scored excellent for every brand,others scored differently for each brand.
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