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That quote of mine had NOTHING to do with checking for black matrix. I was talking about operational colorimetry.
It is difficult to get a good look at the phosphor dots of the 21GUP with the safety glass on...So I was planning to pull the tube and remove the safety glass and look at it up close with it not running (my eyes are young, and considering I've seen a delta gun black matrix CRT up close before I should be able to tell if it is one by naked eye).
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