Love is a feeling, is colourless basically. Love is felt through heart but is preceived through mind. Whatever colour mind associated with this feeling, is considered the colour of love for the concerned person.
Here the girl is mostly shown wearing white, is actually living a different life then others. While is colour of simplicity, purity. Her heart is pure too. Hence White is signified with her character. She doesn't like any other colour ruining her White saree.
The male lead lives a colourful life. But falls for simplicity, purity of the female lead. Signified by White.
Since this story is from his pov. So the title, Ishq ka rang Safed, seems more appropriate.
Wow..nice point of view yaar, Wow the title is really very identical..Thanks a lot for such a beautiful comment..Nice idea dear..The title is very symbolical..I'm happy that I asked this question got many ideas of this title..Thanks again😳