Flung by fates into wine's waves, this site charts my navigations into the fermenting sea beyond academia's herculean pillars.
Showing posts with label secondary fermentation. Show all posts
Showing posts with label secondary fermentation. Show all posts

18 August 2010

REROLLED.BOIL

Daybreak and I find fermentation following forward. With nighttime temperatures under fifty (in August?), the humidifier has kept the tank a happy seventy two. However, I need to ensure the yeasts ferment completely.
Once the bubbling (and my coffee) are finished, I sample the must.
Thus far, the yeasts have neared the same specific gravity as water: 1.000. But to finish the job, they need oxygen and redistribution throughout the must. No air or nutrients means dead yeasts. Also the bubbling CO2 they produce will not go away without degassing the must. So I re-sterilize the secondary carboy, let dry and then siphon.

Even thinking about the bag of skins turns my stomach. Any extraction that could have happened via fermentation is probably over. Also, the carboy's neck is two inches in diameter. The bag is six. So I trash the skins.

Along the way, we taste the must. Surprisingly, it is not poison. It seems almost palatable even fruity, and the sweetness is nearly gone. One niggle though: it is thin. The body and tannin are there enough, but the alcohol is lacking. Without a chemist lab I cannot check the proof. But it tastes under 10% of alcohol by volume.

Time to cheat.
What went into the morning coffee gets dissolved into a test tube with some must and nutrient. Hopefully, the yeasts are still kicking around. Rebooting fermentation with cane sugar will give me more alcohol than before. Where it takes the flavor is unknown.
The next day finds resurrected yeasts churning away at the sugar. If any bacteria join in, we are done for. Yet everything smells clean enough.
Only time will tell.



06 February 2010

SPLASH SPLASH DEGASS

In the evening, after the yeasts had quieted, I set about setting about my secondary fermentation. I emerged from the sulfuric hot spring (i.e.: cleaning my equipment in the bathroom). Once the reek of rotten eggs lifted and my various tubes dried, I arranged the plastic rubber octopus into action.
My yeasts had done a brilliant job but they needed one last chance to ferment off any remaining sugars. So after a few forced pumps of the tubes and my wife's help, the wine frothed into the clear carboy. The book: "Archaeologies of Memory", edited by Ruth M. Van Dyke & Susan E. Alcock, Malden: 2003, once central to my master's thesis, now served as a better leverage to keep the settled sediment at the back of the fermentation tank and out of my tubes.
The yeasts had dissolved quite a bit of CO2 into the wine during fermentation. Near the end of pouring, a pink but very manly foam developed from this remaining gas. Another week would let it breath off.For the sake of science, we tasted the "wine". The yeasts had left the liquid quite hazy. The nose had gained more red current and apple pie qualities with a harsh metallic ring from the CO2. I took a sip, trying to not dwell on the dead, zombie-like yeast carcasses passing my lips.

The palate was gleefully dry and warmingly alcoholic with not a trace of sweetness (I love you goodly, honest hydrometer). A new but balanced acidity and structure of tannins had become apparent as well. The floral, cherry and red berry notes equally persisted from the last tasting: this all seemed like Barbaresco. Annoyingly, however, the finish closed with a light fizzy and bread-like, sourdough quality.

No bottling yet. Patience, patience. Next week would give the CO2 time to evaporate and the suspended yeast cells time to separate from the wine.