By eliminating excess mixture solvents, evaporating dishes concentrate a substance for easier quantitative analyses. With the required temperature resistance to heat mixtures with a Bunsen burner, solutions or supernatants are efficiently evaporated. Typically manufactured of porcelain or borosilicate glass, the chemically inert evaporating dishes have a smooth glazed or fired finish to prevent equipment damage during processing. Pouring spouts permit easy sample transfer after the sample preparing procedure is complete.