A friend recently brought to my attention that the protocols for using Jarden (Ball & Kerr) brand canning lids have changed.
This post from Living Homegrown details some research into the matter. And, in fact, the slightly confusing directive addendum exists at the bottom of the page here on Ball’s website. I’ve been using the new generation lids for the past year and haven’t had any seal failures with USDA-recommended lid simmer rules.
;)
L to R: Old lid (no mention of USA made); new generation lid and new packaging
My advice moving forward: Bring new generation lids to a near simmer, turn it off and let sit in the water until you are ready to use them.