[Lang]

Mike

I think that is the paint used on Gas detector panels either a special plate or some obvious place the driver could see that changed colour to indicate a gas attack.

I think the gas resistant paint is quite different and made so the whole vehicle can be washed down after an attack.

Here is the American system, obviously not widely used, on vehicles loaded for D-Day. They had the fill-in between the stars but most other period photos seem to show a small panel or splash of paint 6-9 inches square (if anything at all).

Lang