Question

If we continue heating a piece of initially room-temperature metal in a dark room, what will be its first visible color?.

Answer 1

Red is the longest of the visible wavelengths.

One would see red first

The visible spectrum can be characterized by "ROY G BIV".

Or

Red-Orange-Yellow-Green-Blue-Indigo-Violet

From the longest wavelength to the shortest (7000-4000 Angstroms)