Nick JD
Blah Blah Blah
- Joined
- 4/11/08
- Messages
- 7,322
- Reaction score
- 456
We add at the start of the boil & grind the nibs through our grain mill, we boil for 60 mins & don't skim. When "dry nibbing" we process the nibs through a coffee grinder to a powder for maximum extraction. The head on these beers matches that of any other similar style not using nibs.
Generally used at approx 110gm per 20L but have gone much higher. Never noticed any coagulated components on the surface, but then we always draw from the bottom (as you would) leaving the surface layer with the break material in the boiler or the yeast in the fermenter. If you are kegging, you are always drawing from the bottom, so again, any surface layer will not be noticed to the very last drop. That said, i've never noticed any surface film regardless. If you are bottling, then you may have to be carefull not to bottle the surface film if there is one.
Sorry, I don't know the science, just practical experience.
cheers Ross
Nibs are about 40% fat. Malted barley is 1.2% fat.
The composition of hot break is 1-2% fat; cold break 0%.
My guess is the kettle floccing agents probably take care of the chocofat.