Ice silk swatch???

[SowIsLifeSowIsLove]

So what am I doing wrong here? Wiki has it as two ice burrower silks in a loom creates the swatch, I'm getting "those items cannot be combined together" when I try to combine them. Someone said I might have to use a thurg loom? There is not one on wiki and I can't find one in thurg, been to all the places that sell sewing or tailoring supplies and not a loom in site.

http://wiki.project1999.com/Ice_Silk_Swatch