Table 1 Standard categories used for differentiation of fingerprints after applying products (Sears et al. 2012; Almog et al. 2014)
S. no. | Category of print | Features of fingerprints | Visibility score value |
|---|---|---|---|
1. | Very strong development (without application of product) control sample | Identifiable fingerprint pattern, clear ridge details, minutiae, and sweat pores were clearly visible, no merging of the ridges, prominent appearance of the ridges, and fingerprint classification | 81–100 |
2. | Strong development (with application of product) | Identifiable fingerprint pattern, clear ridge details, partially visible minutiae and sweat pores, slightly broad margins of the ridges and few or no clump-like formation, and less prominent merging of ridges at some points | 61–80 |
3. | Medium development (with application of product) | Fingerprint pattern can or cannot be identified, broad margins and merging of the ridges, non-identifiable ridge details, less chances of appearance of sweat pores and minutiae, and less prominent appearance of the ridges | 41–60 |
4. | Limited development (with application of product) | Partially visible fingerprint pattern, ridge details not clear, visible sweat pores, and no merging of the ridges | 21–40 |
5. | Weak development (with application of product) | Fingerprint pattern can or cannot be identified, no visible ridge characteristics, and visibility of sweat pores with less appearance of the ridges | 0–20 |