That鈥檚 an interesting question. How lettuce turns brown is well known, but why this happens is a different story. Let's deal with the how first.
鈥淭he customer is always right,鈥� is a time-honoured adage in marketing. It holds true even if the customer is wrong. If the customer does not want 鈥渁rtificial鈥� preservatives鈥� in food, industry will...
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