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In 1945, Florida Citrus Commission scientists found that orange juice evaporated under vacuum lost most of its flavor. They over-concentrated the juice, then added back a portion of fresh juice to restore the taste, a technique called 'cutback.' This produced a palatable frozen concentrate, and within a few years most of Florida's crop went into cans rather than onto tables as whole fruit.
An orange's orange skin comes from cool nights breaking down chlorophyll, not from the fruit ripening. Tropical oranges can be fully ripe and still green. The visible cue consumers trust is manufactured to match their expectation rather than the product's actual state.
Once concentrate became the dominant form, even in the heart of Florida's orange country restaurants served reconstituted frozen juice instead of fresh-squeezed. Processing economics routed the fruit away from the people nearest to it. When a product is optimized for storage, shipping and year-round uniformity, the fresh original becomes hard to find even at its source.
Oranges from the same tree differ measurably in sugar, acid and juice depending on where they hang. Fruit on the sunlit outer and upper canopy tends to be sweeter than fruit shaded inside or low. Varieties also differ, and growers stagger early, mid-season and Valencia types to cover the season. Processing plants blend all this variation into one uniform product, erasing distinctions a close observer can taste.