It's just in the layer of olive oil on top, got all those white spots. Boiled it 45m, just tomatoes cooked down with a basil leaf, left it in the fridge... guessing it's been there a month or two? I'm scared to open it, lol.
Is there a better canning system than mason jars? Why not stainless steel? Why do we need thst silicon seal, ain't there another way? Something more reusable more practical, more durable... one piece tops.