Assembly Line

How brown sugar is made

Refineries reach brown sugar two ways: boil it from dark syrups, or coat white crystals with brown syrup.

stations
6
things upstream
7
raw sources
4
steps from the ground
3

The short version

A sugar refinery has two roads to brown sugar. It can boil the darker syrups left over from white sugar in a vacuum pan until brown crystals form, or it can coat finished white crystals with a brown syrup. Light grades carry less molasses than dark ones. Either way, a film of syrup keeps the sugar damp and soft.

  1. Wash the raw crystals

    Raw cane sugar is mingled with a warm, heavy syrup that loosens its molasses coat. A spinning basket flings the syrup off, and the crystals go on to become white sugar. The syrup is saved.

    Goes in
    Sugar

  2. Boil the leftover syrup

    One patent traces that syrup through char filters into a vacuum pan, where it boils and partly crystallizes. A centrifuge takes out those crystals, and the darker syrup moves to a pan of its own.

  3. Crystallize from dark syrups

    In the brown pan the syrup boils and crystallizes again into a thick mass of crystals in liquid, called massecuite. Britannica describes a blend of brown and yellow syrups, plus caramel for the darkest shades.

  4. Spin off extra syrup

    The massecuite drops into a centrifugal basket. It spins for a set time to strip syrup from the crystals, then the basket slows, reverses, and a plow scrapes the damp sugar off the wall.

  5. Or coat white crystals

    The other road starts from refined white crystals and adds a brown-sugar syrup. Light brown sugar gets about 3.5 percent molasses and dark brown about 6.5 percent.

    Goes in
    Molasses

  6. Dry and bag

    Refinery products are dried and sent to food-grade packing plants. Packages run from single servings to one-ton bags.

End of the lineBrown sugar

Worth repeating

  • Late in the 19th century, white sugar refiners ran a smear campaign against brown sugar, showing magnified photos of microbes living in it.
  • Brown sugars are graded by darkness, and regular commercial brown sugar holds up to 10% molasses by weight.

Back to the ground

Follow every input upstream and brown sugar starts as these 4 raw sources.

SugarcaneSugar beetWaterLimestone

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Gelatin dessert 5 stations · 6 raw sources Cotton candy 9 stations · 17 raw sources Polysilicon 5 stations · 8 raw sources Candy-coated chocolate 10 stations · 20 raw sources Sausage casing 8 stations · 4 raw sources Plastic wrap 6 stations · 11 raw sources

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Sources

Cite this page: "How brown sugar is made." Assembly Line, 2026-11-03. https://assemblyline.org/make/brown-sugar

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