The decarboxylation with heat is what makes the thc potent when ingested.
When smoking, it happens on-the-fly from the combustion or vaporizer heat.
There's a chart in the archives that gives "time X temperature" for efficient decarb.
When you get it just right, there's a dramatic increase in potency.

At 100 degrees C. it takes a very long time.
Use a pressure cooker and you shorten the time needed.
If you will be baking with the butter, you can boil for a much shorter time because the oven's heat will complete the decarb for ya.
Ju's look up decarb in the archives. It's all there.

Aloha,
Weezard
Weezard Reviewed by Weezard on . Made the Butter and Brownies from that Man I just made butter for the first time. Gotta tell my story.... 4 sticks of unsalted butter, 2 cups of water and the duff from my vapo (probably between 1/2 and 1/4 oz. Cooked it on very low for 22 hours. Man the house reeked of weed, but in a good way. Had to add 1/4 cup of water every 4 or 5 hours and stir. Followed the recipe I found here. When I made the Brownies i used about 1/3 cup of the butter. I cooked it at a lower temperature than the box asked for and cooked it about 10 minutes Rating: 5