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How did Daniel Peter create milk chocolate in 1876?

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In 1876, the Swiss chocolatier Daniel Peter successfully created milk chocolate by adding dried milk to the existing formula for sweet eating chocolate.12

Prior to this innovation, the English firm Fry and Sons had already established the foundation for modern confectionery in 1847 by combining cocoa butter, chocolate liquor, and sugar to produce sweet eating chocolate. Peter’s addition of dried milk transformed this base, leading to the rapid proliferation of various flavored, solid, and coated chocolate products.12