Have you ever tried mixing Coke with milk? Within minutes, you’ll notice curdling and colour separation — the milk solids settle at the bottom while the liquid turns darker. This happens because the phosphoric acid in Coke reacts with the proteins (casein) in milk, causing them to clump together. Here’s where it gets interesting — the brown colour in Coca-Cola comes from negatively charged caramel polymers. When the milk proteins clump, they attract and bind with these polymers, forming a brown

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What Happens When You Mix Coca Cola and Milk