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Rinse and Dry
Seeds drying on a paper plate.
Pour off the mold, as much of the water as possible, and any seeds that are floating (these seeds are bad, and would not have germinated, anyway). Rinse a few times, pouring off the rinse water and any seeds or debris that float. Dump the seeds into a fine mesh strainer and rinse well, using your fingers to dislodge any gel that is still sticking to the seeds.
Write the name of your tomato variety on a paper plate, and dump your seeds onto it. Make sure that the seeds are in a single layer so they dry well and don't get moldy. Set the labeled plate aside for a few days so that the seeds dry completely.