I purchased these curtains for my baby's nursery.  They block quite a bit of light, but I would not call them blackout.  I purchased them in white, however I received packages that were labelled "cream" with the word cream crossed out and "white" was written in pen.  The are actually more of a greyish color in my opinion.  They blend in with our light grey walls.  The are quite heavy and seem good quality, although not exactly as I expected.  There were also a couple marks on the curtains, ink marks possibly, not super noticeable unless curtains are closed.