Boley and Trucks n Stuff HO Vehicles

[jwb]

Here's another Boley project, turning a stake body into one of those trucks that carries CO2 and helium tanks:     I'm a little bit stalled trying to figure out what color to paint the Bar Mills gas tanks I have loaded in it. I think there's a federal standard that says non-flammable compressed gas tanks are green, but the ones in this truck don't seem to be that:     I also need to add hazmat placards. Does anyone know what color CO2 and helium tanks are usually painted?