Size 100 crochet thread?

Does anyone know if the finer crochet threads (size 40 to 100) are made in colours other than cream/white? I’d like to get some to experiment with colour mixing for my projects (preferably from a UK supplier), but can’t seem to find anything on Google, which probably means I’m out of luck!
Specifically I’d want colours like chestnut browns, black, grey as well as white.
If only embroidery floss came in really long skeins, they’d have been a good option!

Etsy seemed to have the best choices for cotton thread. See if these will work.

Those look good, thanks! :blush: