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"Actually, the tempered [soda-lime] is a little bluer glass, it can alter the color of it. In fact, at one time we actually had a straw color in all of the Pyrex line. Today when you walk into the company store, it's all blue and that's a cheaper glassmelt because they're not purifying, they're not taking the cobalt out. So it's a cheaper melt, but it's all tempered lime." The U.S. Pyrex website notes: "You may notice that some of our Pyrex® brand glassware has a slight tint of green or blue hue to the dish. It

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