Black scab is formed at
Age of abrasion Less than 24 hours bright red - reddish scab 2-3 days reddish- brown scab 4-5 days dark brown scab 6-7 days black scab ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 114
4-5 days
6-7 days
Less than 24 hours
After 7-10 days
Mechanical injuries