wunder beta

🍯 Honey: supersaturation, crystallisation and why it never spoils

You tip the jar and nothing pours. The sandy plug is glucose leaving a supersaturated syrup, not spoilage — and the lid is why the same pot can last a lifetime.

5
lessons
~20 min
to learn
🔬 Science
subject
Adults
level
Start the course →

What you’ll learn

  1. The jar you thought had gone offTreat crystallised honey as glucose leaving a supersaturated syrup, and learn White's floral averages: 38% fructose, 31% glucose, 17% water, pH 3.9.Not mould. Two sugars and a little water. The plug is chemistry, not a hygiene fail.
  2. A solution that should not stay liquidFollow invertase, fanning and capping from nectar to a 17–18% moisture honey, and read water activity (~0.5–0.65, yeast near 0.60) as the real keep-line.Collect, split, dry, cap. Codex 20%. Yeasts read aw, not the refractometer.
  3. Why some honey sets and some never doesUse White's floral table and the 14°C set point to predict which jars granulate, and treat creamed honey as crystal-size control.Tupelo stays liquid. Clover sets. Dyce and Meixner still point at 14°C.
  4. Why it almost never spoilsName the three antibacterial locks, White's 17% ferment warning, the aw rise when honey crystallises, and the CDC infant-botulism rule.Dry sealed honey starves life. Wet or split honey can fizz. No spoon under one year.
  5. What to do with the set jarReliquefy gently, cream on purpose at 14°C if you want a spread, and keep the jar closed so it cannot steal kitchen steam.60°C water bath, not a boil. Tonight, taste the sandy jar before you bin it.

Questions this course answers

In White and Doner's 490-sample USDA survey, which pair is the average floral honey?

White and Doner, Agriculture Handbook 335: floral averages 38.19% levulose (fructose), 31.28% dextrose (glucose), 17.2% moisture.

Put the hive's honey-making in White's order

Nectar in, invertase, evaporation by fanning, then a wax seal around 17–18% water. Glucose oxidase runs alongside the drying.

Codex's ordinary-honey moisture ceiling.

Codex CXS 12-1981: not more than 20% moisture for honeys not given a wetter exception. USDA grade A/B is tighter, 18.6%. White's ferment warning starts around 17%.

In White's USDA table, about what percent glucose does tupelo honey carry ? the one that stays liquid?

Tupelo: 25.95% glucose and 43.27% fructose. Cotton, by contrast, is 36.74% glucose and sets fast.

Match each name to what the papers actually give it

White on the monohydrate and on inhibine; Chen on the yeast aw line; Codex on hydroxymethylfurfural.

Why does the CDC say not to give honey to a child under one year?

CDC: honey can contain the bacteria that cause botulism. Do not feed honey to a child younger than 1. The jar does not grow the toxin; the infant intestine can.

Grounded in trusted sources

  • [object Object]
  • [object Object]
  • [object Object]
  • [object Object]
  • [object Object]
  • [object Object]
  • [object Object]

Every Wunder lesson is built from real, reputable sources — never invented.

Related Science courses

🥫Canning and Appert: the prize that fed an army🧂Food preservation: salting, smoking, canning, freezing🍵Tea: oxidation, terroir and six categories🍺Beer and bread: the same organism, two civilisations🫘Miso, soy and koji: East Asia's mould🥒Pickling vs fermenting: two ways a cucumber lasts🌡️Food safety by temperature: the danger zone🫧Whipping: foam, protein networks and copper bowls

Wunder is a personalized learn-anything platform — tell it any topic and it builds a beautiful, fact-checked course in minutes, with narration, a knowledge check, and a college-style University track.

Browse more Science courses · All topics · Home

© 2026 Wunder Learning LLC · Terms & Privacy