सानमण्डलनि फानथावगाब रोदाफोरनि दिनथिनायनिफ्राय 20 घन्टानि उनाव बे मेलानिननि माखासे आसाथिं बारलांनो जागायो ।
About 20 hours after exposure to ultraviolet rays some of this melanin begins to migrate towards the surface .