My Grandma used to put a thin layer of butter over the jam/preserve, Ive never tried it but she used to swear by it!
It probably depends on what you are making the jam for?
If its just for you then a good sterilising should be enough but if the lady is making them for the WI (in view to sell) she would probably be working to some food standards health and safety
Hope it all goes well!!
xXx
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I can see the idea behind putting a thin layer of butter over the jam to preserve it, my problem would be with the jam being in a cupboard at room temperature and the butter going rancid.
My original query about cellophane covers versus metal lids was just out of interest to see what other peoples opinions were. I understand it is WI policy to disqualify home made jams, pickles and chutneys in jars with metal lids because they cannot be guaranteed air tight. As far as I am personally concerned it's each to his own, and I use both methods.