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of, 26. Clay, Schultze Apparatus for Analysis of, 25. Clays, Subsidence Methods of Analysis of, 26. Clay, Tensile Strength of, 38. Clay, Transverse Strength of, 38. Cleavage of Clay, 13. Co-efficient of Expansion of the Fired Body, 39. Colemanite, 34. Colloid Theory of Plasticity, 14. Colloids in Clay, 19. Colour Production, 59. Black, 60. Blue, 60. Brown, 60. Cream, 60. Green, 60. Matt Blue, 60. Orange, 60. Pink, 60. Red, 60. Sang de-Boeuf, 61. Turquoise, 60. Violet, 60. White, 59.