Oak cubes work very well, definatly one of my favorite flavors for rice wine. I soak mine in some type of spirit to sterilize and/or to add flavor, put them in a smaller filter bag and toss them in the bottom. Regular raisens are another win, have not tried the golden ones as I remember reading they have some additive that will damage the wine itself or flavor of.
I have a descent sampling of oak cubes around from the "oak tea experiment" Shae Comfort recommended on a podcast once, and I have yet to use them in anything. What cubes do you recommend for rice wine? Do you put them in during the aging process or during active ferment? I'd really like to try oaking my next batch. That sounds delicious!
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As to the acetone flavor I had in mine last week, it is gone and has been replaced with a wonderfully sweet ricey aroma, but you can definitely smell the alcohol heat on it. I read somewhere in this thread that sometimes the fusel alcohols produced during the active ferment can smell like acetone, and they'll mellow out over time. I still have five days to hit the three-week mark, but I'll post results then. It's still humming along nicely, with *lots* of liquid at the bottom and an almost-foamy rice sludge slop floating on the top. Looks weird, smells great. Still no fuzz on mine, and I have a feeling that keeping it completely in the dark has kept that at bay.
Tl;dr re:acetone - maybe not always a death sentence for the batch.
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My "monster batch" is also happily bubbling away in my 5-gal fermenter with the airlock. I had a sad accident and scorched half my rice, so I threw that out. All the proportions are the same as my original post, except that (about) half the rice is jasmine, half is sweet, and I threw in a cup and a half of forbidden black rice for color. (It's such a small proportion to everything else, I'm not expecting it to alter the flavor much.)
Here are some pics of the "brew day" (assembly day?):
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1)Rinsed rice, but I didn't soak it.
2)The yeast nutrient I used. (There are cheaper ones, but I had this one around to brew big beers with.)
3)The RYR/ARL/Yeast ball mixture after taking a spin in my food processor.
4)The rinsed rice - even though I didn't give it a proper soak, the rinsing alone allows the rice to soak up a little extra water.
5) Assembled in layers with the starter mixture sprinkled over each layer, then I got in there with (nearly) surgically-clean hands, mixed and mushed it a bit, while trying to make sure it didn't get too packed down, and made a 5" (or so) hole in the middle down to the bottom-most layer. This supposedly helps to prevent the dreaded "cap" since I do not intend to open the fermenter until the three-week mark (minimum) or until the airlock stops bubbling, whichever is later.