I've been having fun making jam this past year, but I'm not sure I'm doing it right. I boil the jars and lids at least 20 minutes, fill the jars with hot jam (fruit and sugar only), and seal. I'm usually to terrified to boil the filled jars. (Am I being foolish?) The lids sink in, but the part of the jam closest to the top darkens a bit over time.
So, hoping to solve the discoloration problem, I bought some paraffin, but the instuctions don't say how much space I should leave between the wax and the lid, nor whether the filled and sealed jars should be boiled. What to do?