There was a pic on the photo section a short while ago where someone (sorry, I don't remember who) posted a pic of individual salt bars with colored salt crystals on top. I want to color some salt for the same purpose (different design) my question is, what can I use to color the salt? I'm in the UK and we have limited color options compared with the US. I've got some powdered pigments on their way would these work? I guess the water soluble ones would be ok mixed with a little water, add the salt and allow to dry. Any other options? I was wanting red but the red oxide is a little dark and the bright red I ordered is only soluble in oil.