Why aren single-or uniform-color shingles more common?
Shingles using granules of just one color, unmixed with other colors are not widely available, except in white, because technically it’s almost impossible to consistently achieve an aesthetically uniform color appearance. This is due to the variations in light reflecting from the surface of granules that point at so many different angles and directions. These angle variations are the result of the manufacturing process. They are impossible to totally avoid and are especially noticeable in darker colors. To make the visual effect of the granule reflectance more pleasing, several granule colors are usually blended together. In this way, the various colors are enhanced by the variable reflections from the different granules and the blended colors actually become richer to the eye.
