2. Materials and methods
The latent fingerprints were collected on fifteen different substrates which include porous as well as non-porous surfaces. The latent fingerprints were deposited on various substrates as mentioned below and it was made sure that the subject was heavily sweating while depositing the fingerprints even in winters under laboratory conditions and all the 10 fingers were employed for taking the prints. During depositing of fingerprints, donors and substrates uniformity was maintained. The non-porous substrates used in this work are plastic (bottle plastic, transparency sheet, and gift wrapping