otsevärvid

Otsevärvid, also known as direct dyes, are a class of synthetic colorants that can bind directly to fibers without the need for a mordant. This direct binding occurs due to the dye molecule's affinity for the fiber's chemical structure, often through hydrogen bonds or van der Waals forces. Unlike reactive dyes, which form a chemical bond with the fiber, or vat dyes, which require reduction and oxidation, otsevärvid are applied in a single step, typically from an acidic or neutral dyebath.

These dyes are commonly used for dyeing cellulosic fibers such as cotton, linen, and rayon, as well as protein fibers like wool and silk, although their washfastness on cellulose can vary. The color range of otsevärvid is extensive, offering bright and vibrant hues. However, their lightfastness and washfastness can sometimes be a limitation compared to other dye classes, depending on the specific dye and fiber combination. The application process is generally straightforward, making them a popular choice for home dyeing and in certain industrial applications where ease of use is prioritized. Some otsevärvid may require specific aftertreatments to improve their durability.