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 CO2. Show all posts
Showing posts with label CO2. Show all posts

18 August 2010

CRUSTACEOUS.KINDNESS

A day after cheating the fates and re-fermenting with sugar, I rack the must back into the first fermentation tank. After a sound sleep, I wake to check the Specific Gravity.Like my morning paper, another day of reading a near 1.000 SG leaves few surprises. With no CO2 bubbling about, I rack the must back into the glass carboy to kick out loitering bubbles.

After a day of "real" work, I come home and look for CO2 bubbles and off smells.
The next step requires stabilizing the must. The yeasts need to stay dead, or I will have another riot of Pompeii-amphitheatric proportions. So I turn to chemical warfare.Last time, I blindly used a packet of metabisulfite & Vitamin (E) C, which stabilized the Barbarescocanadianwelches. I think. This time, my arms included potassium sorbate and a sulphite (in the handy form of a Campden Potassium Metabisulphite tablet). Combining the sorbate and the sulphite will create sorbic acid. Like the love child of Juno and Jupiter, my Mars-like acid will halt any further yeast orgies.With yeasts vanquished, their CO2 no longer blankets and protects the must from oxidizing. I would like to avoid blueberry vinegar. Instead of panicking like last time (over topping off the must with "real" wine, or worse, water), I turn again to my trusty Private Preserve can-o-neutral gasses.
After an over-thorough spray, I cap the airlock and wait for tomorrow's fun.
A new rise of Sol's chariot sees me ready to clear the must. Proteins and yeast cells still float about in a haze of negative energy. Kieselsol and Chitosan led the charge last time, positively zapping the yeasts, which, in turn, bound into heavy lees and sank. Great. Regrettably, Chitosan comes from crustacean shells, while Kieselsol is liquid silicon dioxide. Why kill crabs and, um, silicons, when more crab-friendly alternatives exist?
Thus, I choose Sparkolloid Powder. Sparkolloid mixes polysaccharides (from fungi or seaweed) with diatomaceous earth (hard shell algae fossils). Without offending any central nervous systems, I boil water and add the powder.

This whole fining process would not be necessary with more time and wine. But with too much airspace, hot summer days and my impatience, I needed to speed it up. So I stir in the Sparkolloid, re-spray the must, airlock it and wait.

A week will reveal whether any of this worked.

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.



26 January 2010

FERMENTATION PERSUASION

Yeast added. Lid shut. Airlock, well, locked. I wait. Austen's Anne Elliot knows how I feel: suffering quietly alone, waiting upon your sugars to become alcohol takes the patience of a truly goodwilled and kind nature. Yeasts, like most gentlemen, are at best conversely inattentive and then later overambitious in character. They must be treated with the ever lightest of attentions, even if one's bloom has vanished early with a rapid increase of the crow's foot about the eye, one might still indulge in the hope of exciting their esteem, thus someday garnering a place amidst their large fortune and...DAY 2: I wake and find the temperature up two degrees. Cracking the lid unveils a foam of Carbon Dioxide from the yeast on the surface. The hydrometer shows the sugars are down 0.004. So I begin the daily stir, giving the yeasts air to breathe. The foam separates and swirls like Jupiter's surface.

Two more days find the yeast cruising through the grape sugars, with the hydrometer bobbing its approval at 1.032 Brix. The apartment smells brilliantly.
The wife takes a turn letting the yeasts breathe.
Once lidded, the airlock pops and bubbles the CO2 safely out of the tank, not letting anything else in. Too much oxygen contact and the wine turns to vinegar or worse breeds invading bacteria.Day 4: A churning thick cap of burping yeasts has formed and Mr. Hydrometer tells me the end is near: 1.020 S.G. I give the wine a heavy last stir and take time to upload more photos.
The fifth day wakes me to a quiet airlock. A layer of lazy froth gets stirred away and the hydrometer dips to 0.999. Secondary Fermentation show time!