I've never used it. But most anything is worth a try. Some things are very heavy, and won't mix well with other colors. They will sink to the bottom of the blank. Even all Mica powders are different. Some are heavier than others. Silver is a very heavy color. At least the antique silver I got from Coastal Scents. There are a few that I hate to use because they take a lot longer to cure.
I've used white embossing power and it floats in the PR more than color it. It is way courser than the pearl ex I know use. Just like the glitter I sometimes add.
Well I guess it could fully color it but you would have to add a ton and which would maybe make it more like a paste.
I think I have a pen around here somewhere. I used it as an extra bit of bling with I think some alcohol inks.