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this? http://www.filmtools.com/maccol.html
I use one to check colors for accuracy in post. I get a shot recorded with it just under the talents face. Then I have the same shot while I CC in post and can check to see if the colors still match or which colors I care about match at least - usually just trying to make sure the talents skin tone is reproduced faithfully. Much of the time I dont have access to the talent to check to see what color their skin tone really is (I forget easily too), but I can match whatever color is closest to their skin. Seems to work pretty well, although I imagine there are other uses for it as well.
how do I use it properly?