You could do what I did the first time I used the wisper threads. I took a small spare piece of the fabric I was working on and did a few rows with first one strand and then with two strands. It will show you the coverage and you can pick whichever one you like best. One of our ladies here on the chat room about a year ago told me there aren't any cross stitch police so I could do pretty much what I wanted to with the piece I was working on. Great advice. I hope this helps. If you have any more questions put it on the chat boards for us. Have a great evening.
cheryl

Thank you Cheryl, I used one strand and doubled it. It was good coverage. I am going to buy a few more colors . This should look nice on Christmas ornaments.

Mary