Moreau produced in-depth studies of the colonies only years before St-Domingue's revolution. As such, he spent time traveling in the Caribbean and returning to France to write and lobby until his involvement with the
French Revolution led to the issuing of a warrant for his arrest. His most notable work,
Description topographique, physique, civile, politique et historique de la partie française de l’isle Saint-Domingue, which he wrote in 1789, has not been fully translated into English. This work develops an arithmetic theory of skin color and the epidermis for the French colony of Saint-Domingue (now Haiti). It hierarchizes a possible one hundred and twenty-eight possible combinations of black-white miscegenation into nine categories (the
sacatra, the
griffe, the
marabout, the
mulâtre, the
quarteron, the
métis, the
mamelouk, the
quarteronné, and the
sang-melé). His work reflects a preoccupation of white colonists with racializing those who intermarry and interbreed with slaves or free
gens de couleur, establishing the caste of white colonists as ''l'aristocratie de l’épiderme.'' ==Politics==