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Tinted bottles shield milk from UV light

When it comes to milk jugs, "Yellow is better," according to Smith Dairy Products, maker of the opaque yellow "Super Jug" of milk. The extrusion-blown, high-density polyethylene jug blocks out ultraviolet light emanating from fluorescent lighting in the supermarket dairy case or from the sun itself, according to the company.

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UV light oxidizes milk, stripping it of riboflavin, which is necessary in order for the body to absorb calcium, says Bill McCabe, director of marketing for the Orrville, OH, company.

"The paperboard industry has been advertising for years against plastic," McCabe says, because the bottles' translucency permits UV light to strip out riboflavin and other vitamins and minerals. "And it gives milk an off-taste," McCabe adds.

Penn State University and a number of chemical companies conducted testing to determine which color performs best under UV light, McCabe says, and yellow outperformed the other colors. The yellow jug blocked out the most light, helped the milk retain its flavor longer and appealed to consumers better than other colors, McCabe says.

In all fairness, it's worth noting that opinions on this controversial subject vary. A study conducted by the Louisiana Agricultural Research Center suggests the decrease in nutrient content and flavor only occurs after milk is exposed to UV light for longer than the amount of time it typically spends in the dairy case.

But McCabe still contends that yellow is better. "From a marketing standpoint, if we had to pick a color, yellow wouldn't be the No. 1 color," he says. "It does help it stand out on the shelf, but it is also confused with orange juice sometimes. But what it does for the product is worth it."

The 1-gal Super Jugs are blow molded, filled, capped, induction-sealed and labeled in Smith Dairy's Orrville plant. The 1/2-gal jugs are purchased from Plastipak (Plymouth, MI). The snap-on, twist-off cap is injection-molded of HDPE by Clayton Corp. (Fenton, MO). LabelTek (Wadsworth, OH) flexo-prints the 60# pressure-sensitive paper labels in six colors and applies a coating of protective polypropylene.

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