Metal primary color does not refer to a specific color, but the background color of the metal that constitutes a certain device. For example, gold is golden, silver is silver, copper is close to gold red, and aluminum is silvery white.

Nonferrous metals: [metallic]? Non-ferrous metals, also known as non-ferrous metals in a narrow sense, are the general names of all metals except iron, manganese and chromium. Nonferrous metals in a broad sense also include nonferrous alloys. Non-ferrous alloy is an alloy with non-ferrous metal as the matrix (usually more than 50%) and one or several other elements added.

Nonferrous metals usually refer to all metals except iron (sometimes including manganese and chromium) and iron-based alloys. Nonferrous metals can be divided into heavy metals (such as copper, lead and zinc), light metals (such as aluminum and magnesium), precious metals (such as gold, silver and platinum) and rare metals (such as tungsten, molybdenum, germanium, lithium, lanthanum and uranium).

Nonferrous metals refer to all metals except iron, chromium and manganese. China listed iron, chromium and manganese as ferrous metals in 1958; 64 kinds of metals except iron, chromium and manganese are classified as non-ferrous metals.

These 64 kinds of nonferrous metals include: aluminum, magnesium, potassium, sodium, calcium, strontium, barium, copper, lead, zinc, tin, cobalt, nickel, antimony, mercury, cadmium, bismuth, gold, silver, platinum, ruthenium, rhodium, palladium, osmium, iridium, beryllium, lithium and osmium.

Generally, non-ferrous alloys have higher strength and hardness, higher resistance and lower temperature coefficient of resistance than pure metals, and have good comprehensive mechanical properties. Commonly used non-ferrous alloys include aluminum alloy, copper alloy, magnesium alloy, nickel alloy, tin alloy, tantalum alloy, titanium alloy, zinc alloy, molybdenum alloy, zirconium alloy and so on.

Because of the importance of rare metals in modern industry, they are sometimes separated from non-ferrous metals and become a separate category. Along with ferrous metals and nonferrous metals, it has become three kinds of metals.