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| Your statement is astonishing in a way, even if confirming my personal experience.
- That younger wine profits from breathing, alright
- But what causes older wine from "falling over" from too much ... ??
- Why do 3 hours of breathing have minimal impact on a 3yrs old Sh. ??
- under what circumstances is the screw capped wine profiting ?
- under what circumstances is the corked wine profiting ?
--- and as you mentioned "acidic"
- why are those from the Valais by average far more acidic than those in the Vaud ?
- has it to do with the height-above-sealevel ? | |
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In answer to your question. Red wine benefits from controlled contact with oxygen so it should come as no surprise that a red wine which has the ability to age would improve if allowed to breathe. Wines that are young have the intensity of flavour to compensate for any reaction and this is why younger 'quality' wines are able to sustain the onslaught of rapid oxidation.
Older wines have much more subtle flavours and have already been exposed to controlled oxidation either through dissolved oxygen in the wine or through microscopic amount of oxygen that flows through the cork and because these wines are much more delicate any prolong exposure to oxygen will degenerate them much quicker and we see this failing over effect.
Screw caps benefit mostly aromatic styles of wine for exactly the same reasons. Oxygen exposure is prone to reducing the aromatic characteristics of a wine and by placing wines in screw cap we are ensuring that they are anaerobically sealed.
Corks on the other hand allow for both a controlled (good corks) and uncontrolled (bad corks) exposure to oxygen. Red wines are able to withstand higher levels of exposure and are therefore less likely to be placed in cork although the practice is starting to be common in Australia and New Zealand.
Uncontrolled oxygen exposure is the natural enemy of wine and can cause changes in the acidity types and characteristics of tannin and flavour development.
Wines in any particular region can be higher than acidity than in other regions for a number of different reasons.
Typically it is climate (cooler climates typically produced higher levels of acidity. Altitude typically produces cooler climates but more acidity could also be attributed to grape varieties, viticulture practices as well as wine making techniques. In short there is rarely one simple answer to anything.
Wines that are made sweeter in style may taste like they have lower levels of acidity even though they often don't.
I hope this helps!