Tested a random color rune on few things to decorate my smitting area. After adding one to my large anvil dident change the color.
[07:08:19] You create a crystal rune of Jackal.
[07:08:25] A small rune created from resources on Jackal and infused with the spirit of Jackal. Colors: R=199, G=223, B=166. It can be used on metal items and will give an item a random color one time.
[07:08:44] You start to place a large anvil.
[07:08:45] You place a large anvil.
[07:08:50] You start to use the rune on the large anvil.
[07:09:00] The large anvil is given a random color.
[07:09:05] A large, heavy metal anvil. You can barely make out the signature of its maker, '.le.pys'. Colors: R=199, G=223, B=166. Ql: 88.262405, Dam: 0.0. It has an interesting aura.
[07:09:05] Wind of Ages has been cast on it, so it will be quicker to use. 
[07:09:05] A tin rune of Vynora has been attached, so it will increase the chance of increasing rarity when improved (10%)
[07:09:05] Circle of Cunning has been cast on it, so it will increase skill gained with it when used. 
[07:09:05] It could be improved with a lump.
picture of the anvil with rune added https://imgur.com/a/d3nlPCc