House of Embroidery (a South African company so shop via Sue Spargo's website if you are in the USA) has three sizes of perle cotton, rayon, silk and silk ribbon. I suspect the "raw silk" and "fine silk" are what we call spun silk and filament silk but I'm not sure.
https://www.suespargo.com/store.php?cat=215
Written by Jane/Chilly Hollow
Blogging at http://chillyhollownp.blogspot.com
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