2.3. รอยนิ้วมือ of different ages
รอยนิ้วมือ that were left at a crime scene might consist of different ages. Here,รอยนิ้วมือ were deposited on brushed metal and white plastic. Natural รอยนิ้วมือ with age of 1 day, 7 days and 14 days were used to test the relative sensitivity of the acid modified หญ้าคา powder in developing aged รอยนิ้วมือ.