How new is the stamped piece? I have a quilt on my bed that my beloved Aunt embroidered the blocks and set them together with sashing and my daughter and I hand quilted the blocks on the blue dotted lines that were provided. My Aunt passed away in 1999 and I was able to get the quilt from her daughter and it has been on my bed ever since and washed umpteen times and line-dried outside and the blue lines are still there.
Now, the newer embroidery pieces are stamped with turquoise ink - so don't know if they are the same. HTH