Exocrine รอยนิ้วมือ — Hands were washed with soap and allowed
to dry. After which, the hands were placed in a clean plastic bag for
45 min before depositing the รอยนิ้วมือ.
Sebaceous รอยนิ้วมือ — Hands were washed with soap and allowed to dry. Fingers were then rubbed on the nose area prior to deposition.
Natural รอยนิ้วมือ — Hands were not washed in the past 3 h and touching the face and head before depositing the รอยนิ้วมือ was avoided.
The รอยนิ้วมือ were deposited by gently pressing a finger on examined surfaces and labeled, respectively. A4 writing paper, white plastic, brushed metal and glass were used as the substrates for รอยนิ้วมือ deposition.