Ridge opening
A deeper guide to ridge opening, winemaker context, oxygen is not simply bad, exposure points, oxidation, reduction, hydrogen sulfide, sulfur dioxide jobs.
The argument
What this chapter will give you
This chapter supports the lesson’s central job: understand topping, oxygen exposure and sulfur dioxide while keeping additions, total sulfur and active fractions distinct.
This is a reading chapter, not a definition enlarged to fill a screen. Its sections build the idea from mechanism and method to the language you can use in front of an actual glass.
Ridge opening
Ridge describes its work as pre-industrial, yet its 2023 Estate Chardonnay sheet gives precise sulfur figures: thirty-five parts per million at crush and seventy-four over the course of ageing. Traditional does not mean chemically unaware.
Winemaker context
John Olney’s team uses native primary and malolactic fermentation, barrels, sulfur dioxide, and pad filtration. Those choices form a protection system. Removing one line from the sheet destroys the context.
Oxygen is not simply bad
Oxygen can support yeast early, influence tannin development, and help certain maturation reactions. Excess exposure can brown colour, consume aroma, create aldehydic notes, and encourage unwanted microbes.
Exposure points
Crushing, pressing, transfers, and topping—refilling evaporation loss so headspace does not grow—all create oxygen opportunities, as do barrel sampling, filtration, bottling, and closure. A cellar manages a series of moments, not one oxygen switch.
Oxidation
Oxidation is a network of chemical reactions, often mediated by metals and phenolic compounds. Dissolved oxygen can be consumed without immediately tasting stale. The sensory result depends on substrates, antioxidants, temperature, and time.
Reduction
Reduction describes a low-oxygen chemical environment. In tasting language, people often use it for sulfur aromas such as struck match, cabbage, rubber, or rotten egg. The chemical state and the smell vocabulary overlap, but they are not synonyms.
Hydrogen sulfide
Stressed yeast can produce hydrogen sulfide, which may smell like rotten egg. Later sulfur compounds can smell onion, rubber, or cabbage-like. Oxygen exposure can change some compounds, while others need different cellar responses.
Sulfur dioxide jobs
Sulfur dioxide helps limit oxidation and microbial growth. It exists in bound and free forms, and only part of the free fraction has strong molecular antimicrobial activity. “Contains sulfites” does not reveal the protection level.
Bring it back to the glass
Three checks before the conclusion
- Record the sensory observation before proposing a grape, place, climate, or production cause.
- Compare intensity, timing, location, and persistence instead of relying on a single descriptor.
- State a plausible alternative and lower confidence when one clue is doing all the work.
The language bench
Solid things you can actually say
Use these as sentence shapes, not answers to copy. Replace the details with what your glass can defend.
What is actually aromatic?
- “The aroma is moderately intense and led by a broad fruit family.”
- “A second savoury note becomes clearer as the sample warms.”
- “I am confident about the family, but not a precise descriptor.”
Which basic qualities are present?
- “The wine is dry, with noticeable sourness and little obvious bitterness.”
- “Fruit flavour fades before the structural sensations.”
- “Sweetness is present but balanced by acidity.”
What happens through time?
- “The palate feels medium-bodied and gently coating.”
- “A fine drying texture develops along the gums.”
- “Warmth appears late and persists in the throat.”
What does the pattern support?
- “Several observations support this interpretation, but the glass does not prove it.”
- “The strongest evidence is structural; the origin remains uncertain.”
- “The line worth keeping is: Protection depends on dose, timing, chemistry and exposure.”
Make the sentence earn its keep
“It is fruity and smooth.”
“It has moderate fresh-fruit aroma, medium acidity, and a soft, low-grip texture.”
The stronger sentence identifies sensory channels and observable relationships.
Try it now
A five-minute field exercise
- Write one smell, taste, and texture sentence.
- Add the likely explanation on a separate line.
- Give the explanation a confidence level and name one alternative.
The line worth keepingProtection depends on dose, timing, chemistry and exposure.