Sunan Abu Dawud
2304
Sahih+3

Narrated Umm Salamah, Ummul Mu'minin: The Prophet (ﷺ) said: A woman whose husband has died must not wear clothes dyed with safflower (usfur) or with red ochre (mishq) and ornaments. She must not apply henna and collyrium

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid