Not “blackout” by any stretch of the imagination. Barely qualifies as “room-darkening.” First photo shows daylight through window in a room with no lights on. Second photo compares “blackout” curtain (left) to the sheer curtain (right) I was replacing. Not much difference, except I paid three times more for the “blackout” curtains. Color is not as expected either. Ordered “winter white,” and they’re definitely silver.