My light tray (small, inexpensive one) arrived today, so I decided to try it out. I wanted to be able to see the colors of the square pieces of dichroic glass I cut from a larger sheet when I lay them out on the window. The light tray is a huge help with this, but it is still a bit of a challenge, as the color perception changes based on the viewing angle. When I am directly over the window (perpendicular to it), this is how the colors look:
However, at a slight angle, the colors change significantly:
With the light tray off, the glass is metallic. This is due to the dichroic coating, and in very dim light the colors disappear and are replaced with a metallic shine. This photo doesn’t really capture it, but it’s the best I could do at the moment.
This Art Deco Sun / Moon mosaic is a good example of this type of glass:
