colorfast
adjectiveUK /ˈkʌləfɑːst/
US /ˈkʌlərfæst/
A colorfast cloth keeps its color and does not fade when you wash it.
These colorfast jeans still look blue after many washes.
OTHER MEANINGS
2. Able to hold its color when exposed to light.
The colorfast curtains did not fade in the sunny window.
3. Designed so that dyes do not bleed onto other clothes.
Wash this colorfast shirt with your whites without worry.
4. Remaining vivid or unchanged over time.
Her colorfast memories of childhood stayed bright.