I haven't used my good buds for cannabutter, I only use my good frosty leaf trimming - have to do something with it eh. I don't leave my butter green (thats just chlorophyll) but instead 'wash it' a couple of times. I do this by putting it back in the fridge to set, and then adding fresh water. Gently warm it again, give it a few swishes around for several minutes and then put it back into the fridge to set. Drain off the water and repeat with fresh water.
I like my butter to not have that planty leafy flavour but I know some folks don't mind the taste at all.
Mostly now though I like to make canna oil. Its quicker, less fuss and just as useful as the butter.