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Originally Posted by Quoth
What are you using to measure? A suitable lab instrument?
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I measured with the Erichson Tint Tester 527.
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What you say isn't physically or mathematically possible.
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There are other possibilities, because I could not test on the same device -
as you write:
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You can't remove the colour filter on eink or lcd non-destructively.
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I only had one device with the same basic screen (Carta 1200) available, but it was controlled completely differently.