Unfortunately, some pretty charity quilts get sold by the recipients for drug money. Some of the shelters in our area specifically ask for quilts made of ugly materials for exactly this reason. Our guild has a prison sewing group where non gang member colors and other not so pretty materials can be sewn into usable quilts for charity. This program which rewards good behavior on the part of the inmates is hugely popular and highly successful in our local low to medium risk prison.
So, when unsure about the material, donate it to someone else to use! It will get a good home and a thankful owner!