Fig. 5
From: Novel C stain-based chemical method for differentiating real and forged fingerprints
a Fingerprints development and differentiation after 1 week (black powder followed by C stain method). b Fingerprints development and differentiation after 2 weeks (black powder followed by C stain method). c Fingerprints development and differentiation after 3 weeks (black powder followed by C stain method). d Fingerprints development and differentiation after 4 weeks (black powder followed by C stain method)