I'm am pretty sure that it is the darker one but I'll have to take some better pictures to show you. But I'm not certain yet. I bought these quite a while back.
Maybe this will help you out a bit.... these pictures are a bit bigger. I put the bottom two on the right there to compare the color. And they are LINEN based.
I've worked with paper and linen and i know the difference. How about this...? How about I send you a foot for 20 bucks. If you think it's paper than send it back. And I'll refund you. Sound fair....?