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I've taught metal clay classes for many years, and my favorite material to make molds of almost anything is Amazing Mold Putty. It's an extremely easy to use non-toxic, 2-part silicone mold making putty that sets up in under 20 minutes. The molds you make will remain flexible for years, allowing repeated creation of your favorite items or textures.
Amazing mold putty is made in Kalamazoo, MI and complies with FDA 21 CFR 177.2600