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Shiny side def needs to face the light ie telescope to avoid reflections.
You can determine which side is shinier by have a bright light behind you. Angle the filter about 45 degrees to light on one side, then flip 45 degrees on same angle the other side. One side will definitely have more of a metallic shine to it. This is the side that faces the light. Most of the baader filters have a v scored into side. It can be hard to see. The pointy end of the v few the telescope. The wide end the ccd chip.
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