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A mirror dosen't reflect light , just image. If yuo break the mirror you can see that the back is black. Black absorbs light, white reflects light. A mirror is just a piece of glass with the back painted black. Tinfiol isn't really good either because it stays bent and reflects the light into spots. White is the best, Some people say mylar is , but I think that white is best. Titanium white if you can get it, if not just flat white.
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