Techniques of French Academie Painters

I have been trying to find a good guide on how the painters of the French academy approached their paintings. Things like: Did they use grisaille? Brunaille? Etc.

For artists like Caravaggio it’s really easy to find a break down of their method and other master artists but those guide seem to focus on renaissance painters where as I am interested in the methods of painters from the early-min 19th century.

Any recos for articles or books that go into detail on how they worked? Or did they just also use the same methods of the old masters?