So pretty!
I would have been so scared to wash the unfinished top.
I quilted and bound an antique top and washed it. It was bubble gum pink and white. Shocked me to pieces when I opened the washer and the pink borders, added later but still old, had run so very much! Three washes with Synthropol and it was all clear.
Your quilting will make the applique even more beautiful. I hope to see your post!