In present study, a new powder — หญ้าคา powder was used for the development of รอยนิ้วมือ. IC is a kind of rhizomatous perennial grass that is common in tropical countries. It is mostly found
at dilapidated land or soil that is not properly maintained. This pestilent weed has been used as a low cost raw material for activated carbon preparation to treat particularly heavy metals from industrial waste water. The idea of using the acid-modified หญ้าคา powder as the รอยนิ้วมือ powder was inspired from the reaction between the acid modified หญ้าคา powder and fingers whereby the acid-modified powder will stick to the finger ridges, causing the finger skin to become black when contacted.
This study was conducted on low cost acid-modified หญ้าคา powder to investigate its feasibility as a powder for รอยนิ้วมือ development which has not yet been reported. Various fingermark constituents and surfaces were used to experimentally determine the effectiveness of the powder. The quality of developed natural fingermarks using acidmodified หญ้าคา powder was compared with the Sirchie® Hi-Fi black powder using a statistical analysis tools known as the Paired T-Test and Con-fidence Interval Procedure. The fingermarks' image quality was evaluated using Image Quality of Fingerprint (IQF) Software.