Originally Posted by Sassyzan
You can't use the gel coloring either, as it is water based. Only the oil based candy colors will work.
You can use water based food colors for modeling chocolate/candy clay though. Just knead it in after the clay has set up, similar to coloring fondant.
Thank you Sassyzan for the info regarding white chocolate and oil based candy color. The white chocolate I have tried to dye in the past never turned out well, now I know why! Can you recommend a good brand of oil based candy color? I would love to be able to dye white chocolate for candy Christmas decorations.