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Article:
  ExpoDisc for Pro (and Easy) Color Capture
Subject:   expensive piece of plastic
Date:   2007-03-13 10:30:37
From:   sibir
10 years ago I had a camcorder which used a white translucent cap for white balancing (you had to turn it on with the cap on). Technically, there is very little to it, you are just capturing ambient light through. I suggest the author try out a few pieces of white/gray translucent plastic like from a milk jug and see if he does not get the same results.