I ended up with a set of dedicated pint mason jars for tomato seeds. Easy clean up, easy to look at the bottom and see that the seeds have settled. Adding a little water works well for me, so often saving one tomato and if you forget that, it dries up. Lids on keeps it cleaner, I don't want to wait for blue and green molds to form on top of the lacto cap either, so I check on them instead of having a set number of days. Add water down the side to float the cap and loosen any seeds attached to it. I have a plastic fork that I use to loosen any tomato material still around the seeds, add water and pour off the tomato bits twice then seeds go in the little seive and a rinse. I use painter's tape to label the mason, and move that to the dish where the seeds are drying. And it can seal the paper envelope too.
