Aloe powder, fine.
Aloe capensis, aloe lucida
“Aloe is the juice, concentrated either by the sun or over a fire, of the fleshy leaves of numerous aloe species found primarily in Africa, Madagascar, etc.” – Excerpt from VIOLIN VARNISHES by Josef and Reiner Hammerl, page 33. More information about aloe, its properties and use can be found in this book.