What is KDM with reference to gold? What are the benefits of KDM?
KDM is a metal. It is also known as Kadmium. The scientific code is 48 Cd 112.41. Cd = Cadmium Atomic No. 48, Melting Point 320.9 C, Boiling Point 765 C. KDM: Gold Jewellery from some places are marked with a KDM stamp which means that the Jewellery was soldered with Cadmium. Cadmium called ‘Kadium’ in some places and marked as KDM was traditionally used in soldering of gold jewellery for its good properties of liquidity and melting at lower temperatures,Jewellers in many parts of the world now use gold solders,which are free from Cadmium.Also note that using any types of gold solder either KDM (Cadmium) or other gold solder, to make the jewellery does not guarantee the purity of gold, as the purity is a representation of the percentage of gold in any metal. Cadmium – is used in soldering gold.Control of KDM soldering on gold may vary from one country to another. Recently Americans and Europeans are using Zinc in place of KDM in jewellery making. 30 Zn 65.38 Zn = Zinc, Automic No. 30,
