Pearl, the measurement of 16 oz referred to in the post is a weight measurement, and would be equivalent to roughly 4 cups of shredded cheese (rather than the 2 cups that are equivalent to 16 fluid ounces). Using less cheese than intended could certainly make a difference in the way the mixture melts. We've also found that heating it too quickly or at too hot of a temperature can sometimes lead to the kind of separation and graininess you describe. Mollie@KAF

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