It is narrated from Sayyidah Umm Atiyyah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "It is not lawful for a woman who believes in Allah and the Last Day to mourn for a deceased person for more than three days, except for her husband. She should not apply kohl, nor comb her hair, nor apply perfume except at the time of her purification, and she should not wear dyed clothes except a garment of 'asb (Yemeni cloth dyed before weaving)."
Bukhari narrated it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العدد / 15525