This Site Might Help You. RE: are there any blue metals? like a dead on solid blue metal
Almost every musical genre branched off from the Blues, including heavy metal. So, I think you should stick to the Blues, it's actually more challenging to play than nonsensical Metal songs, and the songs stand the test of time
Zinc is sometimes described as having a pale blue color, but it's mostly silver with a faint bluish cast. Same goes for cobalt metal. You can make a metal that looks blue with anodization: using electric current, you can oxidize a thin layer of the metal to create a thin layer of the metal's oxide. This thin layer reflects light both from the air/oxide interface and from the oxide/metal interface, leading to interference colors. With the right thickness, you can get blue. This is easily done with titanium, niobium, and tantalum, among a few other metals. This is certainly the cheapest method (outside of dyeing/painting metal). However, the coloration is only on the surface; scratching the metal will show the silver color beneath. Your best bet for a metal that is blue throughout is an indium-gold intermetallic compound called blue gold. I cannot find any pictures of blue gold, but you can look at images of purple gold (an aluminum-gold intermetallic) to get an idea (see links below). Because these are intermetallic compounds, they are brittle rather than malleable like pure metals. Because of this, purple gold is cut/carved and used in jewelry as a gemstone, rather than as a metal. A final option is lanthanum hexaboride. While normally purple, excess boron colors it blue. It is metallic-looking and brittle, and probably even more expensive than the gold alloys above.
If I remember right then polished cobalt has a blue tint not made by radioactivity but the surface reflections caused by it's crystals and how the crystals bend, reflect and absorb white light.
