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In 1773, a Mexico City expert in gold embroidery named don José Mariano Sánchez de Salazar Zitlalpopoca petitioned for a license to operate his own shop and take on apprentices. As handling precious metals was politically and economically sensitive, such professions were by law exclusive, open only to those of proven character, standing, and reputation—qualities understood to be inherited by blood. Thus, to establish his sufficiency for the license don José called forth witnesses to his family's honor, reputation, and good lineage.
Peter B. Villella (Sun,) studied this question.