Chartreuse (liqueur) roots", and that yellow chartreuse is, "Similar to above, adding cardamom seeds and socctrine aloes." However the recipe remains a secret. The monks intended their liqueur to be used as medicine. The recipe was further enhanced in 1737 by Brother Gérome Maubec. The beverage soon became popular, and in 1764 the monks adapted the elixir recipe to make what is now called Green Chartreuse. In 1793, the monks were expelled from France along with all other Religious Orders and manufacture of the liqueur ceased. A copy of the manuscript was made and kept at the Monastery. The original left with
Portrait of a Carthusian the artist’s signature (the fly’s position right next to ‘Petrus ΧΡΙ Me Fecit’ hinting that the fly might be the referent of ‘me’ rather than the painting.) "Portrait of a Carthusian" featured a halo above the monk’s head when it was acquired by the Metropolitan Museum of Art in 1944. However, halos are extremely rare in Early Netherlandish painting and the one in "Portrait of a Carthusian" has long been an object of speculation. Finally in 1994, in preparation for the Met’s exhibition "Petrus Christus: Renaissance Master of Bruges", the authenticity of halo was publicly examined by a panel of