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There are different types of molds and so different types of clay work best in specific molds. Plaster molds are generally used with clay in liquid form, known as slip. In this type of mold, the porous plaster absorbs water and the solid clay is deposited on the inside of the mold, allowed to stiffen and then the mold is disassembled and the casting removed and trimmed. Slump molds or hump molds are generally used with clay slabs and the clay depends on what you are looking for in the end results: porcelain, stoneware, low-fire clay etc.
baking powder
It can be melted down and put into molds to make silverware and jewelry.
Making things out of clay is called ceramics and pottery. Clay itself is not something that we make. It occurs naturally, and we just dig it up and use it.
The food industry, especially those in baking, use molds for consistency and continuity. For example, molds are used in cake, cookie, and candy making.
You'll have to use special baking "molds."
It's usually referred to as an "artist resin", and most sculptors use clay, then make the molds of it.
You can use clay and build one or just buy one from the dollar store.
They used brick,clay molds,and mud to build the mission San Francisco De Asis.
For Fimo Polymer clay and Sculpey Polymer clay should be baked in the oven on a baking sheet covered with foil or baking parchment for about 20 minutes to 1 hour at 130 C / 275 F Or...5-3 hours at around 220, and let it cool in the oven...:) "The information is on the back of the packages" Fimo & Sculpey clay requires an oven, heated to 265 degrees, and bake clay for 30 minutes. And yes, use foil or baking parchment with old cookie sheet. (use the cookie sheet only for clay, never for food)
For sterling jewelry jewelers use a sterling silver dip. I like Hagerty's dip. Jewelers also use baking soda and water when they don't have a sterling silver dip. Mix just enough water with baking soda to make a paste. Rub on your jewelry then rinse and dry. I would not use toothpaste. Using toothpaste is an old wife's tale and can harm your jewelry if you have a high polish fine jewelry. For platinum or gold, use Mr. Clean, water, and ammonia. This is what jewelers use in their ultra sonic to clean jewelry and is safe for all types of jewelry. Half Mr. Clean and water with just a little ammonia.
For sterling jewelry jewelers use a sterling silver dip. I like Hagerty's dip. Jewelers also use baking soda and water when they don't have a sterling silver dip. Mix just enough water with baking soda to make a paste. Rub on your jewelry then rinse and dry. I would not use toothpaste. Using toothpaste is an old wife's tale and can harm your jewelry if you have a high polish fine jewelry. For platinum or gold, use Mr. Clean, water, and ammonia. This is what jewelers use in their ultra sonic to clean jewelry and is safe for all types of jewelry. Half Mr. Clean and water with just a little ammonia.