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Some are dirty from dust others are tinted on purpose.
Purpose tinted safety glass is to prevent glare from room lighting. Glare reflected off the CRT face is attenuates twice as much (coming in through the tinted safety glass and leaving through it) as the CRT image light... But what about the light reflected directly off the outside of the safety glass it's self you ask.... usually the safety glass is tilted down so reflections off the safety are aimed at the floor and not up at the viewer and or the glass is frosted to reduce reflectivity.
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