I am making my first batch of Graff. But of course, I can't just follow a recipe. So, I did a version of jalgayer's Graff with a pound of lactose and 1/2 pound of malto dextrine. And along with the 4 gallons of cider, I also added 4 frozen concentrate containers of apple raspberry juice.
The Graff had an original gravity reading of 1.080 and it has been fermenting for about 10 days with the airlock bubbling about once every 30 to 40 seconds.
I just took a gravity reading and it is at 1.020. Additionally, for lack of a better word, there was a bunch of brown "gunk" on top of the fermenter (I am fermentation in a plastic fermenting bucket). By the way, the sample I took tastes quite good.
I really have two questions: 1) is the bubbly brown stuff on top normal and will it settle with additional time? and 2) how much longer would you wait until you bottle? Would I be making bottle bombs if I bottle now?
Anyone who has experience with this type of beverage, I would greatly appreciate your input. Thank you.