Spiral. This is really great. You confirm some of my observations and give new info at the same time. I have never seen a green (or is it "greenish"?) horn. Would like to examine one, though. You are right when you say that the "dark core" does not have a precise position. I have noticed that too. Keep in touch. Black, White, Indian and Javanese. Who's the fifth? I guess I could google it...
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