quote:

ORIGINAL: Sourdough

Well said, Scott! Very solid comments IMO.

I seem to be increasingly using my Coravin - usually stealing 1/3 to 1/2 bottle at a time for the two of us. I do not feel I typically notice variation over a week or two or even up to a month. My limited experience with storage over 3 months has been spotty. Reds are typically left on a counter, upright, at room temp to be drunk over the next week or two, and collared if longer. White are typically refrigerated before and after needling.

It is I think worth noting that argon is first off, an inert gas. It doesn't react chemically with anything( under anything but super extreme weird laboratory conditions) so is not directly involved chemically. That said, after Coravining, the air space above the wine will be almost pure Argon (say 80% or more if we steal 160 ml and there was 40 ml of ullage before the streal). The volatiles in the wine will be diminished as they vaporize to achieve new vapor pressure equilibria between the liquid and vapor space. So one should anticipate some (small in most cases) shift in the aroma profile. That said, pouring wine does much the same thing but with air and not argon and has the complication of introducing oxygen and oxidation which will degrade the wine in addition to reducing (preexisting) volatiles in the wine. From this perspective Coravining should be superior to opening and recording.

I am a touch embarrassed that, as a Chemical Engineer I had not thought much about temperature effects encouraging the bottle to breathe. The needle hole and its reluctance to seal and thus seep has long discouraged me from extended storage of Coravined bottles. If we drop the temp of a sealed bottle from 70 oF to 40 oF trphe pressure of the vapor space will drop by in proportion to the temperature change relative to absolute zero or 30/530

Or. (70-40)/(70 +460)

as adding 460 converts Fahrenheit to Rankine (absolute 0).

This equates to a reduction in vapor pressure of 5.6% - the equivalent of a 1680 foot rise in elevation. That seems substantial and would seem likely to cause t g e bottle to "inhale" is the needle hole is not sealed. Also worth noting that the volume of air to be inhaled woipuld be 5.6% of the vapor space or 11 ,2 ml in the example above with a 200 ml vapor space. Not substantial but not trivial with extended storage.

quote:

ORIGINAL: Sourdough

Good comment, DrBad. Early on I pulled the needle pretty quickly and noticed similar effects but seepage at the needle hole led me to begin waiting before pulling the needle. Having the bottle lightly pressured with Argon would would certainly reduce or prevent "breathing" with temp change. This does rise the question of needle hole sealing though. If the hole seals then it should not breath. But if it doesn't seal and you put it in the fridge the excess pressure should be helpful in preventing breathing. On the counter it doesn't seem likely to make much difference.

quote:

ORIGINAL: Sourdough

Well said, Scott! Very solid comments IMO.

...

I am a touch embarrassed that, as a Chemical Engineer I had not thought much about temperature effects encouraging the bottle to breathe. The needle hole and its reluctance to seal and thus seep has long discouraged me from extended storage of Coravined bottles. If we drop the temp of a sealed bottle from 70 oF to 40 oF trphe pressure of the vapor space will drop by in proportion to the temperature change relative to absolute zero or 30/530

Or. (70-40)/(70 +460)

as adding 460 converts Fahrenheit to Rankine (absolute 0).

This equates to a reduction in vapor pressure of 5.6% - the equivalent of a 1680 foot rise in elevation. That seems substantial and would seem likely to cause the bottle to "inhale" is the needle hole is not sealed. Also worth noting that the volume of air to be inhaled woipuld be 5.6% of the vapor space or 11 ,2 ml in the example above with a 200 ml vapor space. Not substantial but not trivial with extended storage.

quote:

ORIGINAL: DrBad

quote:

ORIGINAL: Sourdough

Good comment, DrBad. Early on I pulled the needle pretty quickly and noticed similar effects but seepage at the needle hole led me to begin waiting before pulling the needle. Having the bottle lightly pressured with Argon would would certainly reduce or prevent "breathing" with temp change. This does rise the question of needle hole sealing though. If the hole seals then it should not breath. But if it doesn't seal and you put it in the fridge the excess pressure should be helpful in preventing breathing. On the counter it doesn't seem likely to make much difference.

Yes, seepage sucks. I've got a little puddle in my closet from a bottle and of course I keep my Coravined bottles on the top shelf so it's dripped all over the necks of the bottles below :-(

quote:

ORIGINAL: DrBad

I know some folks who seal up the top with wax after they Coravin.

I rinse with warm water and do a puff and don't worry about it too much. I mostly use it for weekday drinkers so plan on finishing the bottles off within a few weeks.

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ORIGINAL: rogerjanss
and then drink 5 glasses simultaneously

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ORIGINAL: BenG

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ORIGINAL: rogerjanss
and then drink 5 glasses simultaneously

I think 2 glasses simultaneously is my limit.

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Has anyone tried using Coravin to pour separate glasses every couple hours and then drink 5 glasses simultaneously with different periods of pours?

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ORIGINAL: Chip Merlot

I also would love to read the results of some empirical testing of multiple Coravin glasses poured at different time intervals. I've had numerous tasting-room experiences where my 2 oz or whatever was poured from Coravin and I've always wondered how they thought I could get a truly representative taste from a wine that literally had seconds of air exposure. And imagine they miss out on a lot of sales that way because people are sampling very dull pours unless they stand there for an hour waiting for it to open up....