I have four lined Pottery Barn silk tab-top curtains in a beautiful green. They are fully lined with cotton and block a surprising amount of light when fully drawn (opaque, but not quite blackout). It's hard to describe how beautiful the green is, as it's like an olive green or dark sage with hints of both warm and cool undertones. So it really looks good with a lot of different colors in the room, and with sun shining behind. The curtains are in great used condition. I have not seen staining on the off-white cotton lining. I am pricing them as a lot of 4.