It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) said: "A woman whose husband has died should not wear safflower-dyed clothes, nor clothes dyed with red clay, nor jewellery, nor use dye (khidab), nor apply kohl."
These are the words of the hadith of Ibrahim bin al-Harith. Al-Saghani added some words in his narration: Budayl bin Maysarah narrated to me that al-Hasan bin Muslim said: I did not see them considering there to be any harm in (applying) sabir (aloe).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العدد / 15533