Welp! It browned in several spots over night. Maybe because of the dirt? Or the heat gun? Or???
Next tests, I'll need to try a two layer method. (one with a lower layer of baking soda, and another with a toilet paper bottom. That should help to deduce if the dirt was the cause of it).
Speaking of, I am spending way too much time on this, heh! I've got two hats and a pumpkin bag to knit, and a small painting to do ( Maybe more like these ). I'll just stick to a cloth of some kind, and let her touch it up how she wants. π€£ .