lightfast

In a sentence

Verdigris is lightfast in oil paint, as numerous examples of fifteenth-century paintings show.

तेल-रङमा भर्डिग्रिस प्रकाश-स्थिर छ, जस्तो पन्ध्रौं शताब्दीका धेरै चित्रहरूले देखाउँछन्।