https://youtu.be/wo4Cia2uxgg?si=sFh0m8ymP92zevJz
To tell if a mirror is two-way, use the fingernail test: press your finger against it; if there's a gap between your nail and its reflection, it's normal, but if they touch directly, it's likely two-way. Also try the flashlight test: in a dark room, shine a strong flashlight at the mirror; if light passes through to reveal the other side, it's two-way, but a normal mirror will just reflect the light
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