Why isn't cold brew just hot coffee cooled over ice?
Show answer & explanation
Answer: Different extraction
Different extraction ✓ — Right. Brewing is a solid-liquid extraction: water pulls different soluble and suspended compounds from roasted grounds. A hot brew has already used high heat to pull a fast, broad chemical mix before you chill it. Cold brew starts with room-temperature or cold water for hours, so its profile can diverge from iced hot coffee.
Ice removes caffeine — Not quite. Ice chills and dilutes; it does not selectively remove caffeine from a finished drink. Caffeine extraction depends on recipe, grind, time, temperature, and coffee dose. If a cold coffee feels gentler, the mechanism is more likely the extraction profile and dilution, not ice filtering caffeine out.
Sugar forms overnight — Not quite. Cold brew sitting overnight is not fermenting into a sweeter drink under normal brewing practice. The sweet impression is mostly aroma and reduced sour/bitter masking, while longer contact can actually increase dissolved solids and titratable acidity. Overnight time changes extraction, not sugar manufacture.
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