IMO, Watermelon is odd color. Some like it light, some like it dark. I go for the middle of the road. Not sure if I got the recipe here on TU or Del's site, but I use a mix of Green Pumpkin and Watermelon to get my watermelon color. I bet if you post a pic of the color you'd like to ultimately have, there's bound to be a genius or two on here that can get you close just by viewing the pic. I myself cannot do that, and rely on trial and many errors. But it sure is fun!!!
Adam
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