Very interesting -- I'll have to come back to read it in more depth later. Thanks for providing that link, Tom!
Polly, I wonder if there is a way to post that link in a sticky at the top for reference purposes. I think it would be really beneficial if information like this could be made available so people who are interested could access more information about plicatas and luminatas, and perhaps some of the other color classifications as well. I know when I was trying to find a definition for neglectas I had some trouble, so it would be great if information like this was available to interested people.