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dye
This term focuses on a permanent or semi-permanent chemical alteration of a material's hue. It implies a deep penetration of color into the fibers or cells of the object, creating a lasting change rather than a surface-level coating. It is frequently used in the context of fashion, cosmetics, and textile industry. While painting adds a layer on top of a surface, dyeing transforms the material itself, evoking a sense of saturation and total immersion in color.
Countable when referring to a specific type or brand of coloring agent (e.g., three different dyes). Uncountable when referring to the liquid substance in bulk (e.g., there is too much dye in the vat).