Blue collage: locut. The blue fining is a clarification of the wine with crystals of potassium ferro-cyanide to avoid a copper breakage. This treatment is effective in stabilizing white wines, but the risks of too high a dosage are such that the countries which authorize it have subjected it to very strict regulations. Blue gluing is authorized in Germany, prohibited in the United States, tolerated in France, but under the responsibility of a wine expert ...
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