The phrase refers to a process for altering the color of the partially shaded region surrounding the complete shadow of an object. It represents techniques and methodologies employed to introduce color to areas that would otherwise exhibit muted or diminished hues, often achieved through layering semi-transparent colorants. An example is applying diluted dye to hair sections to achieve a shadowed, multi-dimensional effect.
This coloring technique allows for the creation of depth and dimension in visual mediums, as well as customized color blending. The nuanced control it affords enhances the realistic or artistic quality of the colored item. Historically, these concepts were applied in artistic mediums to create dimension and shadow, and modern developments allowed for the adaptation of this method in the beauty and manufacturing industries.
