I have *heard* that pencil markings wash out. I'd love to know if that is true or not.
Edited to say - I have also heard of someone who purchased an Amish hand quilted quilt, and the pencil markings were still on it. She inquired and was told that they were always sold that way, and it was up to the purchaser to get them out when she washed the quilt. Again, this is only hear-say.