Here is another way to save tomato seeds for next season.
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Steps:
Cut your tomato in half and scoop out the seeds and put them in a jar.
Add up to a cup of water so the seeds will float in the mixture.
Cover the top of the jar with a paper towel secured with a rubber band. Place in a warm place.
After a few days there will be mold forming on the top. The pulp will start separating from the seeds. This is what you want. You will also see seeds floating to the top.
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When you have a lot of mold on top you are ready to save the good seeds that remain on the bottom. Take the mold and the seeds that floated to the top and throw them out.
Put the remainder in a fine mesh sieve and rinse with water. You want to rinse as much of the remaining pulp away.
Let them dry in the sieve.
Then transfer to a paper towel to dry completely. This can take a couple of weeks.
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Label and place in a plastic bag. Store in a cool, dry place.