Candle sample

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Name (dialectally "Kerzerlprobe") for a widely used but extremely inaccurate and therefore also life-threatening procedure in the old days to measure the content of the carbon dioxide produced during fermentation in a wine cellar using a burning candle and thereby determine the progress of fermentation. In the past, the fermentation gases were also removed via so-called fermentation grids in the cellar door and/or via the vapour pipe (a ventilation shaft). However, this could only be done inadequately without a corresponding mechanical extraction system. This is because carbon dioxide gas is around one and a half times heavier than air. If this is not moved slightly by a draught, the carbon dioxide collects in the layers of air close to the ground at the lowest point of the cellar.

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Candle sample

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