Changes of Mineralogical Properties and Biological Activities of Gypsum and Its Calcined Products with Different Phase Structures

Figure 5

(a) Instrumental colour dL^∗ values, da^∗ values, and db^∗ values’ scatter diagram of RG, CG150, CG350, and CG750. (b) Instrumental colour L^∗ values, a^∗ values, and b^∗ values of RG, CG150, CG350, and CG750 (values within each column with different letters are significantly different ( < 0.05)).

(a)

(b)