Read the statement by Michael Teeuw here.
Black Fabric for magic mirror
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 Hi all, 
 I need black fabric that light can’t pass through it so I can display my monitor behind mirror. My Monitor is small for the mirror I built so I need black fabric to cover the mirror on one side. I would like suggestions where I could find a material like this.
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 I used black construction paper and that works well and is cheap 
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 Black clingfilm. I used. 
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 I just have a black MDF plate cut to the right size. 
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 @lavolp3 Fancy. 
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 Personally, I’d just paint the box it’s in… 
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 I took the protective packing material which was delivered with my mirror. The mirror was wrapped in several layers of a kind of thin black Polyurethan mats, which were perfect for using them to cover the back. 
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 Black construction paper worked for me. Put it behind the mirror and no light goes through it. 



