our professor's old recipe for matte thinner for grisaille “wax emulsion”

ksy elf, Thank you for your quick answer... It's cristal cristal clear for me now...  Thank you so much (from France :) )

Lucie Vergnon, no problem) Have a nice day!

Alice Morgen, Hi) yes, it creates mattifying effect so your oil paints won't have glossy finish! We use it for grisaille sins it is type of drawing technique and it needs to look matt