I have that too! I have no idea what it is but it really sticks if you put a ladle into it right? I have had to scrub my one ones clean thoroughly afterwards.
It is safe to consume though, what I gather anyway, I have however problems with my cider being far too acidic, you might have the same...
I have been producing cider at home for a couple of years. Mostly because I wanted to be able to provide guests with something truly home made. I use apples from the garden (normal sweet garden apples) and use very basic tools, some sort of container and various rudimentary tools to extract the...