The original The Phantom of the Opera is almost all black and white, with the exception of the masked ball scene.
Since the original The Phantom of the Opera was a Silent Film, the color scene is the anomaly.
Silent films were routinely tinted, so this isn't an anomaly just because it's colored. (Although it's still an anomaly because it's real filmed color and not tinting.)
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Silent films were routinely tinted, so this isn't an anomaly just because it's colored. (Although it's still an anomaly because it's real filmed color and not tinting.)