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Is this a sure way of determining that the barrel is infected?
John Neild — Cambridge, Maryland asks,
My barrels are American oak, repeatedly used for wine, and about five years old. When empty, I fill them with water containing a strong solution of potassium metabisulfite (one pound to 50 gallons/0.45 kg to 190 L). I find that when the water solution is a little low, and prior to topping with more solution, a burning sulfur stick will extinguish when inserted into the air space. Is this a sure way of determining that the barrel is infected, or is there something else that would extinguish the burning sulfur stick?