1. not fading or losing color when washed, exposed to sunlight, or worn
Usage: chiefly British spelling; American English typically uses 'colorfast'

Examples

• This fabric is colourfast and will not fade after multiple washes.
• The dye used in these jeans is colourfast, so they maintain their deep blue color.
• Make sure to buy colourfast curtains if you want them to look new for years.
• The manufacturer guarantees that the colourfast material will resist fading in sunlight.
• These colourfast towels have been tested to withstand frequent laundering without losing their vibrant hue.