"The woman whose husband has died should not wear clothes that are dyed with safflower or red clay, and she should not use dye nor kohl."
Sunan an-Nasa'i Book 27, Hadith 149
← Previous Hadith "The Messenger of Allah said: 'No woman should mourn for anyone who dies for more than three days, except for a husband, for whom she should mourn for four months and ten days. She should not wear garments that are dyed or patterned, or put on kohl or comb her hair, and she should not put on any perfume except when purifying herself after her period, when she may use a little of Qust or Azfar.'"

Sunan an-Nasa'i Book 27, Hadith 148 Next Hadith → "It is not permissible for a woman who believes in Allah and the Last Day, to mourn for anyone who dies for more than three days, except for a husband; she should not use kohl, dye nor wear dyed clothes."

Sunan an-Nasa'i Book 27, Hadith 150