värvipüsivust

Värvipüsivus refers to the ability of a colored material to retain its original color when exposed to various external factors. These factors can include light, washing, rubbing, sweat, ozone, and heat. The degree of värvipüsivus is crucial for the longevity and appearance of dyed products, particularly textiles, paints, and plastics.

Different types of värvipüsivus exist, each measuring resistance to a specific agent. For example, valguskindlus (lightfastness) indicates how well a color resists fading or yellowing when exposed to light. Pesukindlus (washfastness) measures the color retention after a certain number of washing cycles. Hõõrdumiskindlus (rubfastness) assesses the tendency of a color to transfer to another surface through friction.

The värvipüsivus of a material is determined by the chemical structure of the dye or pigment used and the substrate it is applied to. Certain dye classes are inherently more resistant to fading than others. Factors such as the concentration of the dye, the dyeing process, and the presence of finishing agents can also influence the final värvipüsivus. Testing for värvipüsivus is typically performed using standardized methods and equipment to ensure consistent and comparable results, allowing manufacturers and consumers to evaluate the quality and durability of colored goods.