In 1754, in his letter to Leonhard Euler, he wrote that his three years of experiments on the effects of chemistry of minerals on their colour led to his deep involvement in the mosaic art.
En 1754, nunha carta a Leonhard Euler, escribiu que os seus tres anos de experimentos, nos efectos da química dos minerais sobre a cor, o impulsaran a involucrarse na arte do mosaico.