As long as the cider is pure stuff, no additives, after it turns hard a little later on the mother will start forming. Make sure that you use a wide mouth type of container to make it easier to get the mother out, that was my first mistake, I used a gallon jug, but I had no idea that the mother was going to form in it, one would form and get to around 3/8ths of an inch thick, that one would drop to the bottom and another would form. Their were five of the layers in the jug before I drained and saved the vinegar, scored around the jug with a glass cutter and changed containers. The Mothers themselves look like a soft jelly, but their almost like a very soft silicone in consistency, and their pretty tough................steg