I just bought a beautiful green piece of fabric, used as curtains (although it's to heavy really for this purpose).
It's wool and has the same design as Hallingdal, only when I came home
and placed a sample of Hallingdal 65 (kvadrat) on it, it looks double the size
almost.
Is this just another fabric or are there variations?
Quality and weave are the same (judging by the eye)
It's just a hopsack weave.
There are and were many mills producing wool hopsack. Yours looks a little more loosely woven than the Hallingdal, so it might not wear quite as well---or it might! Did you do a burn test to check fiber content? It might have some nylon in it, which will help with durability.
Also, yours has two threads running in each direction whereas Hallingdal has just one.
Wool smells like burning hair and
leaves a bead of ash that crushes easily. It's also self-extinguishing.
Nylon melts and leaves a gooey, shiny, black blob. I've read that it smells like celery when burning but I never got that impression.
Polyester and maybe also acrylic will also melt but with a more acrid odor. Also, the unburned fibers are shiny if you look very close in good light. Wool fibers are not shiny.
Cotton, rayon, and linen all smell like burning paper and leave a little bit of soft ash, light gray to black in color, that rubs away to nothing between your fingers.
Blends are harder to figure out. When I was experimenting with testing blends, I compared the unknown fabric to those where I knew the content for sure and it was still tricky. Sometimes there's just an edge of melted crud.
Also, use a candle flame rather than a match because the sulphur from the match will obscure the smell of the burning fiber. If you're testing a suspected blend, it's easier with a small swatch but you don't need more than a square inch.
It's very easy to be fooled! I once bought--and not that long ago-- what I thought was a remnant of beautiful soft wool. When I got it outside in bright sun, I noticed the shiny fibers. It is now in my car for draping over stuff that I don't want visible.
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