It is narrated from Umm Salamah (may Allah be pleased with her): "A woman whose husband has died should not wear any dyed clothes, nor apply kohl, nor adorn herself, nor wear jewellery, nor use dye (khidab), nor apply perfume."
This is mawquf (a statement of the Companion, not attributed to the Prophet).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العدد / 15534