Found this in a thread titled "what is the best color" ( I think ) ...might be "which is the best color".
Original poster was asking about coloring terra cotta flower pots. Here is one answer posted by someone else.
" I like YR24 E08 E19 or for a darker terracotta- YR65 E08 E19"
Here is the link to the original thread, hope this is what you were looking for...
Forums at Splitcoaststampers