‘Trying Kumihimo with satin (rayon) embroidery floss. It is too slippery to hold an even tension:

I wove a piece long enough for a bracelet, tied it off, and pulled it. After pulling it, some of the unevenness was gone, but not all. This one will be for me, so it’ll do. Maybe, if I used Kathy James new mini loom, and watched my tension more carefully, I could get better results. The rayon floss has a nice sheen and is worth another try.