[poopscoobler]

Are there any solid ( like plastic ) substances that can be seen clearly through on one side, and on the other side can not be seen through?  Say, looking through one side is like looking through a window or through clear plastic, and looking at the other side, you can only see black, or red, or green.

I am making some costumes and I would like to have different color eyes that can be seen clearly through on only one side. On the other side I'd like them to be black, green, red, purple, blue, and brown. Does this kind of substance exist?

[sjb]

Are there any solid ( like plastic ) substances that can be seen clearly through on one side, and on the other side can not be seen through?  Say, looking through one side is like looking through a window or through clear plastic, and looking at the other side, you can only see black, or red, or green.

I am making some costumes and I would like to have different color eyes that can be seen clearly through on only one side. On the other side I'd like them to be black, green, red, purple, blue, and brown. Does this kind of substance exist?

http://en.wikipedia.org/w/index.php?title=One-way_mirror&oldid=547172616  ?

[Arkcon]

Many optical interference filters have one, mostly opaque mirror finish on reflectance (that's if you're looking at them from a distance) and a a single transparent color if you're looking through them.  Here's a source that will sell to citizen chemists:  http://www.edmundoptics.com/optics/optical-filters/  Although the partially silvered mirror mentioned by sjb: is really the cheapest way to go about it.