Marking an antique quilt
I'm currently hand quilting my great-grandmother's Dresden Plate quilt. The blocks sat in a trunk in the attic for decades, and it just seemed right to put them together and finish it! I typically use a hera to mark for hand quilting, but with a Dresden Plate the open areas are quite large and I think it would be very fiddly to keep outlining the different elements of the design with a hera. I'm hesitant to use anything that has any chance of marking permanently or re-appearing. Due to its age and fragility this quilt will not be washed, so anything that requires laundering to remove it isn't an option. Ideas?