The color is still made today, but ordinary animal bones are substituted for ivory.
The colors he used were made by himself.
The colors are made by the artists from natural sources.
But the color was not made available to gardeners until 1989, when several collectors found two more blue varieties in China.
The colors and patterns of butterflies are made by tiny scales.
Once this solution was found for making red glass, other colours were also made this way as well.
The school's colors were originally made orange and white.
But most often color was made to play against the profile of the image.
"In the old days, this color, Indian yellow, was made from bulls' urine," he said.
The various colors in a tattoo are made from different materials.