Quote Originally Posted by berkshires View Post
I know you recently made maple candy, so you may have noticed that if it boils hard it will boil over. On the stove you can just turn the heat down, but on the evaporator, not only you can't you, but you don't want to. Instead if you add defoamer it can make the bubbles pop faster.
I meant to mention this when first responded to your post. While making the maple candy it try to boil over on a few occasions, and I did have to lift the pot to stop it. Eventually it stopped trying to do that.

Your example really helps me understand the two types of foam and when I should add the drop of canola oil.

Just out of interest, is there something unique about canola oil, or could one use corn oil or avocado oil?