There are flower vases made of 100% pure tin. Tin is known as the most expensive metal after gold and silver, it is very malleable and flexible. Though having nearly the whiteness of silver, it does not rust easily nor will air tarnish it readily. From old days, tin is known to absorb impurities and purify water, it is said that water in a tin container does not spoil easily so that flower in it lasts longer than other containers. On the other hand, there are flower vase stand made by curled copper lines, which shows unique form and allows you to arrange many ways.