Vallejo Metallic Panel Metal Color Set
One or the other is familiar with the Vallejo acrylic paints. A set with acrylic-based metal paints has been available for some time. There are four shades of 32ml each. These are 77,701 aluminum, 77,703 dark aluminum, 77,712 steel and 77,724 silver. Stirring is made easier by the balls in the bottles.
These colors are intended for the representation of a living metal surface of an airplane. In the instructions, there are further references to other metal colors and sets. The latter always contains four 32ml bottles.
Conclusion: Vallejo implemented a good idea here. These four colors are sufficient to make the metal surface of an airplane appear realistic. Because you can combine them with each other in an unlimited way, not just for model railroaders!