Fun fact! Drying grapes to make raisins reduces the water content and increases the proportion of sugar by weight. Click to read more.
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Drying grapes to make raisins reduces the water content and increases the proportion of sugar by weight. For example, green grapes are 24% sugar, but that proportion increases to 60% by weight when the water content goes down.
Source: https://www.agmrc.org/commodities-products/fruits/raisins