What dimout lining does

The before is the verticals. They had bleached out from green to plum. Who knows.. The drapes; again made from my current favorite, Rococco from Fabricland, has a dimout lining.

You can really see the difference. It was sunny and hot this day and the temperature in the room changed dramatically as soon as the drapes were closed.  

I estimate the r-value of the drapes to be about 4, this is a substantial increase in cost saving for heat loss in the winter as well. In the before picture, the sun shining on the new hardwood floors is quite noticeable, this is just damage waiting to happen.