Glazes of oil pigment were then added, which allowed for subtle and transparent tonal gradations. They often have trouble printing large areas of the same or subtle gradations of color. The picture shows a luxuriantly vegetated wood with varying gradations of greenery. Forked fingerings allow recorder players to obtain fine gradations in pitch and timbre. The gradations of scribble density produce a continuum of tone that implies three dimensions. A better representation with multiple color gradations requires an advanced process, spatial anti-aliasing. The raw materials are powdered into 16 gradations from fine to sandy grain textures. The dial has fine gradations for precise measurement. Within every class, there are numerous subtle gradations in status. These are just two methods used to achieve gradations of tone. The distinction is not absolute and there can be gradations within each. Tricolor should not be mistaken for the natural gradations in a tabby pattern. The ink may be diluted with water to produce gradations, a technique called ink wash. That means the concept has "gradations" of significance or "unsharp" (variable) boundaries of application. This makes it difficult for fine gradations in punishments to be achieved.