During the time that His Holiness the Exalted One lived in Bushihr and was in the trading business, a few merchants bought some Prussian blue dye from His blessed Person
AFNAN.Afnán, Mírzá Ḥabíbu’lláh. Memories of the Báb, Bahá'u'lláh and ‘Abdu'l-Bahá: Memoirs of Mírzá Ḥabíbu'lláh Afnán (trans. Ahang Rabbani). Kalimat, 2005. English translation of Khátirát-i-Ḥayát. Vol. 4 of “Witnesses to Bábí and Bahá’í History”.https://bahai-library.com/pdf/r/rabbani_habibullah_afnan_memories.pdf