Ceiling White Paint

I used white ceiling paint to cover certain brands ghosts on the ceiling of my bathroom last night at 11:30 pm. This is not the next 14 hours and it still looks gray tinted. How long does it take to become white?

Put a layer of paint on it.

Check the content of titanium dioxide paint. It is the pigment that makes white. A cheap paint very little since it is a relatively expensive component of premium paints and have a lot. A good white paint will be very white painted immediately after. While wet, it will be brighter than when dry, but basically the same color.