The recipe of the veritable natural Gustave Bernardel rosin is strictly the same from the original of the 19th century production. The secret process was first transferred to the Francais family, famous violin makers in Paris and New York. Nowadays, it is still handcrafted in the same tradition, unit by unit, by Corelli who inherited it from Jacques and Jean Francais. Strictly selected raw materials come from top quality pine trees, using the ideal galipot (first sap of the tree)