I had already returned other curtains once. I have also had about three different colors, trying to get this right. This product's reviews were positive, so bought them. I waited  until our new carpet was in- just put them up. For white curtains they do block a lot of light. In the day time the color appears to be a very light gray or off white. No cream or yellow tone. The color does not appear to have a drop of blue in it and the room is blue. I wish there were a drop of true blue , but then you either get baby blue or spa. I do love the quality. Nice heavy fabric with correct dupioni pearlescent sheen. Not too shiny. Not cheap looking.