Making a simple glass, plate or spoon takes hours. In order not to waste the expensive raw materials, the coppersmiths would not make any mistake. In contrast to warm smiths the copper kitchenware can be brought, formed, to the right shape through a cold procedure by using special chasing hammers, thanks to the elasticity of the metal.
The hammered copper will tarnish over time and can be renewed to its original beauty. Check this link for cleaning solution: https://mbq.ro/diy-how-to-clean-copper-and-make-it-shine/