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__________ is a cheap filler, mined from natural deposits, used in magazine and book paper. It’s not as bright as CaCO3 and TiO3, has an index of refraction of 1.55.

__________ is a cheap filler, mined from natural deposits, used in magazine and book paper. It’s not as bright as CaCO3 and TiO3, has an index of refraction of 1.55. Correct Answer Clay

Clay (or kaolin) is an inexpensive filler, mined from natural deposits, used in magazine and book paper. It’s not as bright (80-92%) as CaCO3 and TiO3, has an index of refraction of 1.55, a specific gravity around 2.58, and is coarse. More clay’s used than any other filler in paper accounting for 90 percent of all fillers and coating pigments.

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