
Window coverings designed to block out nearly all light, creating darkness in a room. They are typically made from thick, opaque materials.
And we were in a we were in a an office building and there was some blackout blinds, very thick blinds.
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"Blackout blinds were mentioned in an anecdote where an infrared camera revealed a small fire at the bottom of curtains, demonstrating how the camera could 'see through' the blinds to detect heat."




