These are samples of weaves. The article and handwritten note on the table describe the making of vikingship sails. The weaves were coarse and tight but still had some light coming through them when held up to the light. They were all made from wool on a reconstruction of a viking loom.
This is the upright viking loom. This is how the viking sails were made. The sails were all made from wool or flax -- possibly hemp -- and took quite some effort. One reconstruction sail had and area of 90 m2 and used wool from at least 200 sheep. The weavers produced 157 continuous meters of material 65 cm wide, weighing 90 kg. It took 7850 hours to produce, about 4.5 years for one person. Additional time was needed to stitch the pieces together. The sail was eventually greased to make it wind and water resistant.
These are samples of wool using period colors. The picture to the left and the first one to the right are with a flash and the one all the way to the right is without. I did both in an attempt to preserve the representation of the colors on the photos.