Looking at my TV in the reflection of the mirror, colours are richer and darker
Actually looks better.
In: 3
Mirrors are not quite perfect at reflecting light, so a bit of light gets scattered or absorbed by the glass which will result in a slightly darker reflected image, depending on the amount and color of the light.
If your TV looks better in the mirror, try turning down the TV Brightness setting a bit, or turn down the Backlight a couple of numbers and see if the colors look better in person.
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