1. Paint Analysis

2. What crimes involve paint?

3. Hit and Run
Burglary
Painting forgery

4. Paint Analysis Comparative studies to see if from common source
Paint Chip On Victim
Suspect Car
May be able to determine color, make and model of car
No Suspect Car
Paint Chip On Victim

5. What is Paint?

6. Paint= Mixture of pigments (Color) Additives Binder Compound
Solvent (Evaporates when paint applied)

7. Auto Paint Electrocoat Primer: Onto steel Resists Corrosion
Black to Grey

8. Auto Paint 2. Primer Surfacer: Smooth out surface, hides seams
Light Grey or Red

9. Auto Paint 3. Basecoat: a.k.a. Colorcoat “eye appeal”
may have metal flakes

10. Auto Paint
4. Clearcoat:
Unpigmented
Glossy

11. Paint As Evidence
Individual Characteristics or Class Characteristics?

12. Class unless……
Multilayered Paint Chip
Custom Finishes

13. Problem A single type of car paint can be on many different models
For a given color/type of paint, batches don’t vary much in composition
Binder chemical composition may vary very slightly from batch to batch
What to do? What to do?

14. Paint Analysis
Perform pyrolysis on paint sample coupled with gas chromatography
Polarized light microscopy
Emission spectroscopy
Neutron activation
X-ray diffraction
X-ray spectroscopy

15. PDQ (Paint Data Query)
Law enforcement database of specific paint formulas added onto cars since 1974

16. Art Fraud and Paint
Need to show materials in a painting were unavailable in the real time that they were made

17. Case Study “Shroud of Turin” Christ’s Death Shroud? Christ's blood on
linen?

18. Human dried blood on linen (Brown)
“Christ” blood on linen (Red)
1000X-Real blood (Brown)
1000X- Red Ochre Pigments

19. Hans Van Meegeren
Traded fake paintings for genuine artwork in the 1930s

20. Christ and the Disciples at Emmaus
Supposedly an undiscovered masterpiece by Vermeer

21. Johannes Vermeer
Last Supper supposedly by Vermeer

22. Technique
Used a synthetic phenolformaldehyde resin - known as Albertol or Ambertol - dissolved in a spirit such as turpentine and/or an essential (i.e., non-fatty) oil such as oil of lilac or oil of lavender, which would then be mixed with hand-ground powder pigments.

23. He heated the resin transforming its chemical composition so that chemical tests would show it is really not the chemical it actually was
He painted over low value17th century paintings. He scraped away old painting

24. “Leveling Paint”