Quote:
Originally Posted by nekokami
I think the black duct tape I've seen has a white sticky side. Wouldn't that work as well as two layers?
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Yes, that should work. The sticky side of the tape should be white. It is important that the tape sits very tight on the glass. There should not be any air bubbles between tape and the glass surface. I realized this last night while reading in bed. The white tape I used is old and does not stick too well. After a while the smudges started to appear again faintly. When rubbing the tape with a finger the smudges disappeared again.
I guess the tape acts like a mirror, but only when it sits tight.