A two way mirror allows what, like 20% of light to pass through it one way, reflecting the rest, and the other way it doesn’t let any light through (maybe a little).
So if you paint the side you can see through, you should just have an ordinary mirror on the other side. I’d probably do a test on a small sample first though, I’m wondering if you’d be better off using white or black paint (if it would make a difference).
A one-way mirror, also known as a two-way mirror, one-way glass, or two-way glass is a mirror which is partially reflective and partially transparent
Beautifully confusing.