1.
Some Call it Art: Case studies involving the spraying of illegal graffiti in the UK Dr. Louissa Marsh

2. Slide 1

3. 1. 2. 3. 4. 5. 6. 7. Slide 2 Spray can Rucksack Sprayed can top
Spray can nozzle
Latex glove
Can of paint
Marker pen 4. 5. 6. 7.

4. Suspect’s clothing examined for paint balls
Slide 3
Suspect’s clothing examined for paint balls
x40 stereo microscope

5. Slide 4
x100 stereo microscope

6. 22 17 4 3 21 2006 & 2007: 20 submitted graffiti cases
Slide 5
2006 & 2007:
20 submitted graffiti cases
67 submitted spray cans
MTN Pintura 22
Belton Molotow 17
Plasti-kote 4
Molotow Coversall 3
Others 21

7. x200 dark field microscopy
Slide 6
Green spray paint
x200 dark field microscopy
Orange spray paint
X200 bright field microscopy
(cross polars)

8. Purple spray paints mounted side by side x200 magnification
Slide 7
Purple spray paints
mounted side by side
x200 magnification
reflected light
(cross polars)

9. The same spray paints x200 magnification light through blue filter
Slide 8
The same spray paints
x200 magnification
light through
blue filter

10. Slide 9
x200 magnification
light through
Ultra-violet filter

11. Submitted can sizes (%)
Slide 10
Submitted can sizes (%)
Spray Cans
Fullness on submission (%)
Nozzle present ?

12. 1st 2nd 3rd 4th % Frequency of colours found on
Slide 11
% Frequency of colours found on
items in the form of paint balls
% Frequency of submitted
control colours
% Frequency of submitted
can colours
Blue Black Silver
14.2% 26.8% 14.9%
Green Silver Black
13.6% 19.6% 13.4%
Red Red Red
12.4% 13.4% 10.4%
Black, silver
& Pink Blue Green
9.5% 11.3% 9.0%
1st
2nd
3rd
4th
Order of Frequency

13. Many thanks for listening
Questions?
Many thanks for listening