So, my thoughts are, a pot wrapped in styrofoam peanuts will have areas where the styrofoam is in direct contact with the pot ("contacted areas") and other "open areas" where the styrofoam doesn't actually touch the pot's surface. As the wash or glaze dries, soda ash evaporates/migrates to pot's surface in the "open areas", but no evaporation or surface migration of soda ash occurs in the "contacted areas" (i.e., where the styrofoam touches its acting like wax resist). Carbon trapping will occur in the open areas where there is soda ash present. Conversely, no carbon trapping happens in the "contact areas" because there is no evaporated soda ash on the pot's surface at these touch points.
Yes but the wax resist (I have done this, rubber bands are good for straight lines ) makes the soda migrate to the sides. You don't get carbon trap where the wax is (we get pretty good orange usually with a malcom davis).
I think maybe the popcorn actually sucks moisture out where it is located (maybe sponges would work too). Thus causeing the opposite effect. More carbon trap in the spots that are touching.
I'll have to try this out soon, am curious now.