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🍮 The chemistry of caramel

Heat one pure ingredient and hundreds of new compounds appear. Sugar's slow collapse from clear syrup to bitter black, degree by degree.

3
lessons
~10 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. One ingredient, hundreds of productsExplain how heat breaks sucrose apart and rebuilds it into aroma compounds and brown polymers.Caramelisation splits sucrose, drives off water, fragments the pieces and reassembles them, producing buttery, nutty and toasted flavours and the colour, all from one ingredient.
  2. Temperature is really a moisture gaugeInterpret candy stages as sugar concentrations and describe why cooled caramel behaves as a glass.Boiling point rises as a syrup concentrates, so each named stage is really a water content, and the brittle result is an amorphous glass that slowly reabsorbs moisture from the air.
  3. What actually happens in the panDiagnose crystallisation, compare dry and wet methods, and explain what happens when cream meets hot caramel.Seizing is crystallisation from a seed, acid and glucose jam the lattice, dry and wet methods trade speed against control, and cold cream in hot sugar flashes instantly to steam.

Questions this course answers

What is a candy thermometer really telling you about a sugar syrup?

A syrup boils at a temperature set by its sugar-to-water ratio. As water evaporates the ratio shifts and the boiling point climbs, so temperature is a proxy for concentration and therefore for the final texture.

Put the stages of caramelisation in order

Split, dehydrate, fragment, polymerise. Aroma comes mostly from the small fragments; colour comes from the large molecules built out of them.

Why does adding a spoonful of glucose syrup or a squeeze of lemon help prevent a caramel from seizing?

Crystallisation needs identical molecules stacking into a regular lattice. Introducing other sugars, or acid that splits sucrose into two different ones, gives the lattice pieces that do not fit.

Around what temperature does sugar begin to caramelise and take on colour?

Colour and aroma appear from roughly 160 °C upward for sucrose — well above the hard-crack stage, which is why a clear brittle toffee can be made without any caramel flavour at all.

In your own words, why does a hard caramel go sticky if left out on a plate?

It is not spoiling; it is very slowly redissolving itself in humidity drawn from the room.

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