Page 23 - A Burning Question Fire Debris

8. Gradually heat the sample container carefully
under low to medium heat. Do not overheat
container as doing so may degrade or
ignite liquids. Do not heat above 100 °C, or
approximately 212 °F.

9. As container is heated, gas will escape through
tube and should generate a positive result on
the tube. This is indicated by a brown-green
ring on the diesel fuel tubes and a dark green
color change on the gasoline tubes. The
location of the ring or the front of the color
change along the side of the tube may then
be used to estimate the concentration of the
ignitable liquid in the air in parts per million
(ppm=mg/ L=mg/kg).

10. Heat approximately 20-30min until color
change is observed. Additionally, after heating,
tube jar may be removed from heat source and
incubated at room temperature overnight to
allow for complete color change.

11. Record your observations on the data
collection page.

12. Share your results among the remaining
groups.

THE MYSTERY OF LYLE AND LOUISE 23