Platinum platinum:
Also known as pure white gold or platinum. But these names are unreasonable and easily confused with K platinum. Its correct symbol is Pt. It is silvery white, extremely malleable, with a specific gravity of 2 1.35, a melting point of 1.700℃, a Mohs hardness of 4-4.5 degrees, stable chemical properties and no acid-base corrosion except aqua regia.
Palladium: (palladium)
It is a member of platinum group, silvery white, with symbol Pd, specific gravity of 12, lighter than platinum, stronger in ductility, slightly harder than platinum, and insoluble in organic acids, cold sulfuric acid or hydrochloric acid. But soluble in nitric acid and aqua regia. Under normal circumstances, it is not easy to oxidize and lose luster, and oxides will be produced on the surface around 400℃. If left in the air for a long time, it will turn gray, and palladium jewelry is generally rhodium-plated.
Palladium (palladium)
Platinum group element, symbol Pd, silvery white, lighter than platinum, stronger in ductility, slightly harder than platinum, insoluble in organic acids, cold sulfuric acid or hydrochloric acid, but soluble in nitric acid and aqua regia. Under normal circumstances, it is not easy to oxidize and lose luster. Jewelry industry uses it alone or as a component of gold, silver and platinum alloys to increase its hardness. Common in the market are gold, palladium, alloys of gold and platinum and palladium.
Guide to the purchase of palladium
In the world, the moral imprint of palladium jewelry is "Pd" or "palladium", which is expressed by a few thousandths of purity. For example, the purity of Pd900 is 900‰, and the specifications of PD ornaments are PD 1000, PD 950, PD 900 and PD 850.