For Big Easy Blends, who created their line of Cordina ready-to-go frozen drinks in eco-friendly pouches, their biggest challenge eventually became their biggest advantage.

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Suppliers of frozen drinks machines have told Coke there had been a few cases of metal residue in dispensers in recent years, the company said.

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Mention rum to most people and thoughts turn to colorful frozen drinks festooned with paper umbrellas, or worse: spiked Coke products, usually enjoyed in the stands at a college football game.

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Tiny amounts of metal found in frozen drinks machines were similar to those found in food cooked in cast iron or stainless steel pans, according to independent lab tests, and posed no health risk, the firm added.

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Dunkin' Donuts expanded its menu to include frozen coffee drinks and lattes, introduced a coffee debit card and became more ubiquitous, including putting shops in locations such as Home Depot stores.

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Their line of frozen to-go drinks include a variety of flavors, including Classic Lime and Watermelon MarGOritas, Strawberry DaigGOri, PinaGOlada, and ChoGOlate Mudslide housed inside a re-sealable CapriSun-esque pouch.

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His suit alleges that Coke managers knew that drinks machines were allowing metal residue to contaminate some products when they were frozen.

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"I have been stunned by how much dairy there is in Shanghai compared with 12 months ago - there are coffee houses, ice cream parlours, frozen yoghurt bars, " she said, noting that the market in UHT milk drinks is also growing.

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