OK, everyone I know who cans says, "ABSOLUTELY NOT!" "NO WAY!" "DON'T YOU DARE! "IT'S NOT SAFE!!!" But, I'm not convinced. I have been reusing canning lids for a long time; I reuse them once, then throw them away. I carefully inspect them before reusing them. I make sure they are clean, lay flat - they basically need to look like they're brand new (other than the writing). If not, I toss them. If they have a little outward nick on the edge from being opened in a previous life,
I simply roll the lid along the counter to smooth it out:
I have had just as good a success with the reused lids sealing, if not better. My guess is that I could use them even another time or so, but since I have so many from friends who pass them on to me, I can afford to pitch them after I've reused them once. :) It saves a ton of money, and I'm able to can up a storm without having to factor in the cost of new lids. Plus, it always was and still is the green way to go! And, there's nothing more endearing that reusing a lid from a friend:
Emma is growing up now, and no longer writes the year 2006 as "20006",
or feels the need to put a smiley face and her name on a jar lid. :)