I've recently brewed a batch of apple cider with juice from the supermarket, so I thought I'd try to experiment with similar juice.
I picked up a 3 litre (0.8 gallon) bottle of Apple and Mango juice, added some SafCider yeast and crossed my fingers ...
The night I pitched it, it was a cold night so I placed it on a heat-pad overnight. Next morning it was fermenting like crazy ... air-lock popping every 2 seconds. I immediately switch off the heat-pad and let it continue at room temperature (usually around 20c / 68f).
That was about a week ago.
This evening I opened the bottle to check the gravity ... it absolutely stank of sulphur
... it was putrid. I ditched the lot of it.
The OG was 1.042 and FG was 1.01.
So ... any ideas what went wrong?