Have a technical question you can't find the answer to in FAQ's? Ask it here. Game problem questions that do NOT pertain to things like training advice, what would my horse do well in, how much is it worth.
So if you wanted a color other than what would normally show up in a foundation line.. then you would have to purchase the color for one of your foundies in order to incorporate it into your line and still keep it pure?
Yes, you would have to buy a dye and dye your horse with it before breeding. That's the only way to get a new color except in a few very select breeds.