Wine diamonds? Well, actually this is fermenting wine with a good yeast production going on. But, there are such things as wine diamonds or wine stones. That's what vintners call the white crystals in the bottom of a bottle of finished wine. It's not bad for you. The wine will be fine. Cold temperatures cause it, more commonly in red wines, but can occur in whites. It actually is a natural process and actually represents a high quality wine that will taste and smell wonderful.
You can prevent these crystals from precipitating by putting the entire carboy into a refrigerator or cold storage prior to racking and bottling. That's 40-46 degrees for 7 to 10 days. Cold temperatures will accelerate the formation of the crystals. Once they have formed rack and bottle immediately. If the wine is then refrigerated at a temperature lower than the temperature the carboy was in, more crystals may form. This is a natural phenomenon.
However, there are those that say that the cold stabilization actually will change the nature of the finished product and would rather that the wine not be as aesthetically pleasing as those in the US are used to. In Europe people actually seek out the diamonds as they feel they are getting a wine at just the right time - at the peak of it's development.
In other words, the longer the grapes stay on the vine, the more wine acid will accumulate in the grape. The more time these grapes are given to ferment, the less wine diamonds will fall out of solution during fermentation, but the greater chance they will form in the bottle. In other words, they are an indicator that the grapes have ripened long and have been fermented slowly and with great care.
So, just what are the crystals? Cream of tartar! Just like the cream of tartar used in cooking. So, don't worry if you see those little crystals in your wine. It's tartaric acid crystals from some really good grapes. These wine diamonds actually help preserve the wine and give some of the tartness to the wine, although citric and malic acids also play a role.
They can form spontaneously on corks or drift to the bottom of the bottle. Either way, while you will probably want to decant it off, it's still some really good stuff. In fact,fermentation of grapes is how commercial cream of tartar is made. So when you see cream of tartar in the baking aisle remember that somewhere there's some grapes that went to good use.
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