I just cut my lid's rim off. Saves me having to faff about with any caked up gunk later and provides a little area for steam to release if I angle the lid slightly to the side.
You can use many things though, for pickling. Yes, even the old stand by of Vinegar. Good enough for eggs, beetroot, onions and piccalilli... the stuff goes well with chips too, but wouldn't recommend after it has been used for pickling.
I have used lemon juice in desperation before and that also worked very well.
alum has been the best and most consistent. I get mine from a variety of sources, but mostly from Fischer as is comes in a larger size and still costs less in the post than getting it from the UK.
ps link for the knowledge base.
http://portalgc.knowledgebase.net/di...03906786441803
click on the product info on the left side and then type in safety pickle and it will come up with a list
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