Beschreibung
🧪 GCSE Biology Food Tests — quick review!
Need to remember the results? Start with the colour change 👇
🥔 **Starch test**
Add **iodine solution**.
✅ Positive: **orange-brown → blue-black**
❌ Negative: stays orange-brown
🍬 **Benedict’s test**
Tests for **reducing sugars** like glucose.
Add **Benedict’s solution**, then heat in a hot water bath.
✅ Positive: **blue → green / yellow / orange / brick-red**
❌ Negative: stays blue
💪 **Biuret test**
Tests for **protein**.
Add **Biuret solution**.
✅ Positive: **blue → lilac / purple**
❌ Negative: stays blue
💧 **Emulsion test**
Tests for **lipids** — fats and oils.
Add **ethanol**, shake, then add **water**.
✅ Positive: **white cloudy emulsion**
❌ Negative: stays clear
⭐ Quick memory:
Starch = iodine = blue-black
Sugar = Benedict’s + heat = brick-red
Protein = Biuret = lilac
Lipid = ethanol + water = cloudy white
Save this for your GCSE Biology revision ✅
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