The best colour for viewing room walls

The smartest labs we’ve seen have their viewing room walls painted dark grey. In choosing wall paints for our own viewing room, we were inspired to do some research. Here’s what we found.
The smartest labs we’ve seen have their viewing room walls painted dark grey. In choosing wall paints for our own viewing room, we were inspired to do some research. Here’s what we found.
One-way glass is transparent on one side but opaque on the other. It's often used in research labs and allows observers to watch participants without being seen.