red pigment on a horse chestnut leaf
written in thulth script
The text, part of verse 64 from surah Yusuf (XII), reads: ‘But God is the best to take care [of him], and He is the Most Merciful of those who show mercy.’
The red pigment maybe gouache, minimum or led lead.
N.F. Safwat, The Art of the Pen. Calligraphy of the 14th to 20th Centuries, The Nasser D. Khalili Collection of Islamic Art, volume V, London 1996, cat.144, pp.205 and 207.