Polyform-Sculpey Souffle Clay. Poppy Seed Black. This lightweight clay is perfect for jewelry making using multiple techniques! It is strong and self-supporting to avoid cracking in large pieces. Has a beautiful suede finish when baked. This package contains about two ounces of souffle oven-bake clay. Comes in a variety of colors. Each is sold separately. Conforms to ASTM D 4236. Made in the USA.