Question

What are blackout curtains?

Answer 1

Blackout refers to a foam-backed, opaque fabric used to black out light. Blackout fabrics are most commonly found in hotel rooms as curtainlinings or drapery fabrics, blocking much of the light that would otherwise enter through a window when the curtains are closed.
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Answer 2

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here is ur answer...
Blackout refers to a foam-backed, opaque fabricused to black out light. Blackout fabrics are most commonly found in hotel rooms as curtain linings or drapery fabrics, blocking much of the light that would otherwise enter through a window when the curtains are closed. For travelers, third shiftworkers, and parents of babies, blackout is an essential element in the bedroom. Besides window coverings, other uses for blackout fabrics include wallpaper, movie projector screens and planetarium domes.
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