Specialist Pigments

Question 1

Why are the study of tattoos of interest to forensic science?

Answer 1

• identification
• tracking movement of people and animals

Question 2

What is the issue with tattoos as evidence?

Answer 2

• colour perception
• description of tattoos is open to interpretation
• chemical analysis removes interpretation issues

Question 3

What is the analytical workflow of specialist pigments based on the fact that they are made from organic or mineral pigments?

Answer 3

same with paints and other pigments
1. all microscopic techniques - understanding penetration depth and pigment distribution
2. IR - organic binders and pigments
3. Raman - inorganic pigments
4. SEM-EDX & XRF - elemental composition of layers
5. Pyrolysis-GC/MS & microchemical testing