1. The quality or degree to which a dye, pigment, or color resists fading when exposed to light.
Usage: Plural form of lightfastness; Commonly used in art, textiles, and printing industries

Examples

• The artist chose pigments with excellent lightfastnesses to ensure the painting would not fade over time.
• Different dyes have varying lightfastnesses depending on their chemical composition.
• Textile manufacturers test the lightfastnesses of their fabrics before selling them.
• The lightfastnesses of these watercolors are rated on a scale from excellent to poor.
• Museums prioritize artworks made with materials of high lightfastnesses to preserve them for future generations.