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Citrus Red No.2

Florida oranges are sometimes bathed in a dye permitted by the FDA and known in the trade as Citrus Red No. 2; but the oranges must be stamped with the words "Color added", in purple letters and, under Florida law, they must have 10% more juice than the minimum required for undyed oranges.

The problem with oranges is that the green chlorophyll in the outer skin is protected by a thin membrane that breaks down in chilly weater, destroying the chlorophyll and turning the orange orange. It has nothing to do with ripeness.

So they need cold conditions to become orange, and if the weather stays warm they remain green (in Thailand, they never turn orange). Much of the green Florida fruit is used for juice.

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