Yes, canning jars are lead free.
Make sure to prop the jar up off the bottom of the pot, and never expose it to rapid temperature changes. Let it air-cool. Place it on a dish towel when you take it out of the pot.

Use as much herb as you can get in there and still have it loose enough to stir or shake.
stinkyattic Reviewed by stinkyattic on . How I make 'clean' cannabutter- a tutorial I like to turn my 'popcorn buds' and shake into cannabutter for making caramels and chocolate truffles. A problem with confectionery is the high temperatures that one needs to bring the sugar to before it is at the correct stage for making candy. Typically, caramels will be brought to 245 degrees F, and if there is any plant material or even excess chlorophyll in the butter, it will have a scorched and very unpleasant flavor. So this is a little tutorial on the process by which I make my Rating: 5