I swapped out my Holbein Mineral Violet with Cobalt Violet. The Mineral Violet was so dried out, it wouldn't rewet, took forever to pick up color rich enough to paint. I'm not particularly happy with the Cobalt Violet either, the background on this page which appear 'pink' on my monitor, and a pale (very pale) violet on the page, is very weak color wise as well. I know I could mix a purple, but I'm lazy and wanted to be able to dab a bit in shadows without having to do a lot of mixing. I think I have a tube of Ultramarine Violet, I think I'll dig thru my boxes of paint and see if I can find it. Any suggestions on a good rich bluey violet?