The example of producing seed like on the article that describe how to produce tomato seed. On this production, the tomato should be sliced then separate the seed from the pulp by filter it then keep for fermentation process. Fermentation process on producing tomato seed need about 3 days. After pass this process then rinse the tomato seed several time until the tomato seed clean from the tomato pulp. Then the tomato seed being dried in warm weather. This drying process need several days until the tomato seeds are not stick each others. After all this process pass it's mean we have tomato seed and we can keep this seed in plastic sealed for the next seeding.