From Sahih Muslim (Hadith 3740):
Umm `Atiyya (Allah be pleased with her) reported that Allah's Messenger (ﷺ) had said:A woman must not observe mourning for one who had died for more than three (days) except for four months and ten days in the case of her husband. And she must not wear a dyed garment except one of the types made of dyed yarn, or apply collyrium, or touch perfume except a little perfume or incense, when she has been purified after her courses
Reference: Muslim 3740