The Cravendale (personally, I'm Cravenchip) milk jug can detect sour milk.
The technology used in the jug was discovered by the company's R&D team while researching the bacteria that actually turns milk sour, and is essentially a unique PH sensor that's built into its base. When sour milk is detected, a small LCD display on the outside of the jug changes from 'Fresh' to 'Sour'.
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