I dont much about this stuff either.
Our harsh sun can turns reds pink and blacks purple in one Summer and it makes me just want to use paint.
Iirc, there was a thread were UV resistant anodizing was discussed and the subject of different grades of anodizing in relation to colour and hardness came up. Worth a search.
I'm not young enough to run alloy grips. Talk about suffering for your art! My M900 came with fancy gold Rizoma grips, but they're in a box now where they belong.