my mom made a paper mold out of a scallop shell.... she softened up some polymer clay in her hands, then pushed a real shell into the clay, i think she may have baked the mold with the shell in it. once it cooled, she popped out the shell.
then she wet up scraps of mulberry paper and smushed them into the mold, and put it on the radiator to dry. it made a really cute shell shape, and it wasn't heavy or breakable since it was paper.
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