Quoted from mamawaldee:
. Perhaps it might be better to source fully tinted glass and polish it off over the lower playfield. Anybody know how to get a hold of plate glass with a full reflective coating?
You need some "one way" security observation glass.
You want it tempered, not just plate/float glass.
A regular "mirror" is made by fully coating the glass with evaporated aluminum (93% reflective ), then painting over the aluminum to keep it from oxidizing or scratching.
A "one way mirror" is made by putting a 50% mirror coating on the glass. When you are in a bright room, the 50% reflective side will make the glass appear to be a mirror. When you are on the dark side, you can see through the mirror into the bright room.
Think of mirror sunglasses, from the dark side, your eyes see through to the outside world. From the bright side, the world sees a mirror.
Every single crappy cop drama show has a "one way" mirror scene during an interrogation.
(science says that there is no such thing as a one-way mirror, so think of them as a 2-way mirror if you need to)
So if you got the proper size one-way mirror, and then polished off the aluminum on part of it, you could make your own pin2k glass.
Now, all we need is someone with a light meter to measure how reflective the NOS pin2k glass is....