Which information is NOT included in the A.S.M.E. stamp on a boiler?

The A.S.M.E. stamp on a boiler provides essential information regarding the safety and quality standards that the boiler meets. This stamp typically includes the type of material used in construction, the manufacturer's name, and the safe working pressure of the boiler.

The correct answer, which identifies the color of the boiler as not being included in the A.S.M.E. stamp, highlights that color is not a relevant factor in determining the safety or certification of the boiler. The A.S.M.E. stamp focuses strictly on technical specifications and safety standards rather than aesthetic attributes. Color may vary according to manufacturer preferences or branding but does not relate to the boiler’s performance or compliance with safety regulations. Therefore, it is not part of the vital information required to ensure proper functioning and safety in operation.