Hi Guys,
my tuppence worth here, gas paint was applied to many vehicles, on a flat panel where it could be easily seen, truck bonnets being a nice flat area. However, it was found that the heat of the engine caused this reactive paint to change colour as if exposed to gas. No doubt the desert heat may have had it's effect as well. Apparently, there were so many false-positives that the practice was discontinued altogether. So, one can expect that even a tin of paint may have changed colour if exposed to heat.
Cheers,
Dave
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