Fermentation at 50 Hours: Water Release and Gas Production, Entering the Stable Intervention Phase
Fermentation has reached the 50-hour mark.
At this point, the bag shows two clear signals:
- Significant water release from the fruit
- Gas (CO₂) starting to accumulate inside the vacuum bag
This means the system has shifted from “internal fruit reactions” to “whole-bag reactions.”
Water Release and Gas Production Signal a Phase Change
In the first 36 hours, fermentation was mainly happening inside the fruit. The skin and flesh still held their structure.
At 50 hours:
- A noticeably higher percentage of fruit has ruptured
- Pectin and juice have been released, forming free liquid
- Microbial metabolism is now producing significant gas buildup
These changes don’t mean something’s wrong. They simply indicate that fermentation has entered the liquid-dominant phase.
Why Re-vacuum at This Point
Gas production itself isn’t a problem.
What needs attention is the “uneven environment caused by gas accumulation.”
When gas gets trapped in the bag, it causes:
- Localized pressure differences
- Uneven liquid distribution
- Varying fermentation rates in different areas
So at this point, I chose to:
- Remove the accumulated CO₂ from the bag
- Restore a high vacuum state
- Flatten the bag back to an even thickness
This action isn’t about restarting fermentation. It’s about keeping the existing fermentation under control.
Flattening Isn’t About Breaking, It’s About Evening Out
At this stage, flattening serves three clear purposes:
- Redistribute the liquid
- Eliminate thickness variations in the bag
- Reduce the risk of localized over-fermentation
By now, the fruit structure has already softened. Whether it gets “crushed” is no longer the key concern.
What really matters is: whether the whole bag still operates as a single reaction system.
The Shift in Operational Logic
One thing worth noting:
In the first 36 hours, the goal was to “guide fermentation to start.”
After 50 hours, the goal becomes “preventing fermentation from getting out of control.”
Same actions—vacuuming and flattening—but the role has changed.
This isn’t active intervention. It’s system maintenance.
The next focus will shift to “how to end this fermentation.”
Until water release stops increasing and gas production slows down, this system just needs to be kept stable.
The drying phase that comes later is what will truly shape the final flavor.
Related Posts
Evening Out Fermentation: Why I Flatten the Bag After Coffee Cherries Soften
Fermentation isn't just about time and microbes—geometry itself is a control variable. Documenting why I flattened a vacuum-sealed bag of anaerobic coffee cherries at 36 hours, and what I observed.
Homemade Premium Fish Sauce: A Taiwanese Terroir Fermentation Experiment with Whitebait
Inspired by Vietnam's Red Boat fish sauce, I'm attempting to make premium fish sauce using Taiwanese whitebait. Breaking down fish selection, onboard salting, and traditional fermentation techniques to explore Taiwan's fish sauce potential.
Homemade Tabasco: A Straight Line Through Fermentation with Taiwanese Chili
Using Taiwanese bird's eye chili, coarsely ground with salt, fermented in a vacuum bag at low temperature, then finished with homemade white wine vinegar. This isn't a Tabasco clone—it's using Tabasco's logic to make a local fermented hot sauce.
Sourdough Bread at 18°C: A Practical Record
Balancing structure with home-milled whole wheat and bread flour. In a cool environment, starting from levain, controlling hydration, not chasing big holes—just observing whether the structure holds and fermentation is on point.
My Fourth Attempt at Artisan Bread: Still a Disaster, Looks Like a Geography Model
Documenting my fourth attempt at European-style bread, analyzing the failures: not enough hydration, unhealthy yeast, folding too early
Starting Point of Whole Cherry Anaerobic | Taiwanese Arabica, Nothing Added
No salt, no sugar, no water — a whole cherry anaerobic fermentation at 18°C room temperature. This isn't about showing off techniques. It's an experiment in restraint and judgment.