Residual
sugar is
the measure of the amount of sugar that remains in a wine after fermentation has ceased, expressed in grams per liter, and it is the primary determinant of a wine's sweetness level, ranging from bone dry (less than 1 gram per liter) to very sweet (over 100 grams per liter); the perception of sweetness, however, is influenced by acidity, alcohol, and tannins, so a wine with moderate residual sugar can still
taste dry if balanced by high acidity; in poetry, residual sugar represents the lingering sweetness of memory or sentiment, the
unspoken or unfinished aspects that persist after the main event, and it is a key concept for understanding how balance and perception work in wine, making it a useful metaphor for the interplay of emotion and technique in
a poem.