These do a pretty good job blocking light even though they don't have a rubbery backing. I have blinds too and I can see a bit through them but not nearly as much as the curtains which I had before. I feel very good for the price.A con is that there is no pleating to them. When I got them I didnt' have an ironing board so there are wrinkles and I can't make them "pleated". But when I pull them down for cleaning at some point I will address this.Interestingly enough (I have bought Black, Khaki, and Grey-White) the Khaki block light completely, the Black mostly block - but not as much as I would like), and the Grey-White doesn't block that well at all which is disappointing and resulted in my changing my 5 star rating to a 4.
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