Saving Tomato Seeds in Three Easy Steps
From Roger Harris, former About.com Guide
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Clean the Seeds by Fermenting the Pulp Mixture
Add a small amount of water to the crushed tomatoes in a clear jar or container. Leave in a warm place for a few days. The pulp will eventually form a moldy cap or crust with the viable seeds sinking to the bottom. The action of the natural fungi and bacteria will clean the seeds, while eliminating some, if not all, seed-borne diseases.