A mirror is green.
Not silver. Not white. Not colorless.
Actually green — a very pale, subtle, slightly sickly shade of green.
Here’s why:
Glass (even very clear glass) absorbs tiny amounts of red and blue light, but lets green through most easily
When light makes multiple round trips inside a normal household mirror (front surface → reflective backing → front surface again → your eye), this slight green preference gets amplified
Most everyday mirrors therefore have a faint green tint when you look at the edge or stack many reflections (e.g. mirror facing mirror)
You can see it yourself right now with two things:
Look very carefully at the very edge of a normal bathroom mirror (the greenest part is usually near the cut edge)
Or do the classic trick: hold two mirrors facing each other → look down the hallway of infinite reflections → the color you see slowly fading into the distance is pale green, not neutral gray/white/silver
So while we casually say “mirror-colored” to mean silvery-white…
a real mirror is actually very faintly green.
The only mirrors that are truly neutral/silver-colored are special “first-surface” mirrors (reflective layer on the front, no glass in front of it) — the kind used in telescopes, lasers, and some high-end makeup mirrors. Almost no household mirror is made that way.