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We all have LCD flat panel screens .... some monsters 24" and bigger.
Why not clean up the computer screen , no dust of muck on it , and the open up something like MS Paint and create a full screen sized object that is as pure white as you can get and use that as the "light box" to get the custom white balance (in a darkened room) ? (would the screen luminance be sufficient ?)
Or alternatively get hold of nice cheap whiteboard and take that outside on a sunny day and use that to get the custom white balance ?
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