Quotation from: The Notebooks of Leonardo Da Vinci

Written by: Leonardo da Vinci

On varnishes [or powders] (635-637).

635.

VARNISH [OR POWDER].

Take cypress [oil] and distil it and have a large pitcher, and put
in the extract with so much water as may make it appear like amber,
and cover it tightly so that none may evaporate. And when it is
dissolved you may add in your pitcher as much of the said solution,
as shall make it liquid to your taste. And you must know that amber
is the gum of the cypress-tree.