Jim, the violet is an iridescent acrylic paint made by Jo Sonja and is sold by Turners Retreat and Snainton. You can buy a pack of 6 different colours for about £12. It is very effective on wood and because it is fairly thick you can create various designs within the paint itself ie you can stub it on with a stiff paint brush or create a design with the tip of a screwdriver etc.etc, Before you use this paint you have to put a matt black acrylic primer on first. \this helps the iridescent to shine through.
Regards
Terry