Grounding-colors are those especially prepared for tinting large surfaces, as backgrounds and borders. They are sufficiently fluxed to be applied in pale, delicate tints, and in thing washes will fuse and glaze. There are twenty-six different grounding colors on Lacroix's list for this purpose ; but should any of the painting-colors be preferred, they must be additionally fluxed. The grounding colors are not recommend for painting, although they can be so used for any delicate work where pale tints are wanted.
Glass colors are those specially prepared and fluxed to paint with on glass. Glass fuses at a lower temperature than china, and consequently the heat required to develop china colors would melt the glass to a misshapen mass. Therefore glass colors are made to fuse a much lower temperature. In addition to colors, raised paste and enamels, both transparent and opaque, are especially prepared for glass.
Not with standing all that has been said and written to the contrary, all colors for painting on china will mix, and are susceptible of unlimited combinations.
China colors are frequently alluded to as "hard," "medium," and "soft," signifying the degree of
