Tomato seeds not fermenting
I am trying to ferment my tomato seeds. Put them in a plastic cup of tap water (chlorinated) and placed them for a few days on the windowsill. After 5 days or a week, it didn't ferment. Read that warm weather helps it ferment faster, so I put an over mitt on the top of my hot water urn and put the cup on the oven mitt. The water warmed up and I started to see white spots develop on the surface of the water. I stirred the cup since I saw forums say you need to stir the cup twice a day. After that I stopped stirring the cup and nothing else developed any further and the gel sac still surrounds the seeds.
It has been 2 weeks since I started fermenting.
A few minutes ago, I washed the seeds in a sift. Put them back in the cup and poured bottled water on it. What am I doing wrong and what do you suggest I do?