I am working on sewing my sandwiched quilt together. My sashing is a very deep burgundy color and the cornerstones are a very light beige color. I am stitching along the sashing using a thread color that is the same burgundy color as the sashing. When I get to the lighter cornerstones, do I change the color of thread or do I keep going in one solid straight line the entire length of the row? If I sew along the cornerstone I am going to end up with some burgundy thread showing on the beige fabric, is this okay? Thank you everyone for your assistance. Happy Quilting.