Hi peacock68--

I was looking for the same info myself recently. Here's a link with some helpful info that you can cut and paste in your browser to view. You will have to scroll down the page for the info you are looking for but I feel it had good comprehensive and overall info in it. I saved it in my favorites for future reference. Happy stitching.

http://www.nordicneedle.net/stitching-materials/threads/101-pearl-cotton-floss/