Hi About the DMC floss. I have heard red and the dark colors sometimes do run...
You can if you are not sure like one of the other ladies said do a sample. Then you will know.
If you are using cotton for the quilt, I subjest you use a cotton emb thread too. I use Rayon and some poly on my emb machine but never hand emb with it....
Best of luck with it.... Beatiful C thats my inital :9)