Ecole de Paris: During the nineteenth century Paris, France, became the centre of a powerful national school of painting and sculpture, culminating in the dazzling innovations of Impressionism and Post-Impressionism. As a result, in the early years of the twentieth century Paris became a magnet for artists from all over the world and the focus of the principal innovations of modern art, notably Fauvism, Cubism, abstract art and Surrealism. The term School of Paris (Ecole de Paris) grew up to describe this phenomenon. The twin chiefs (chefs d'école) were Pablo Picasso who settled in Paris from his native Spain in 1904, and the Frenchman Henri Matisse. Also in 1904, the pioneer modern sculptor Constantin Brancusi arrived in Paris from Romania, and in 1906 the painter and sculptor Amedeo Modigliani from Italy. Chaïm Soutine arrived from Russia in 1911. The Russian painter Marc Chagall lived in Paris from 1910-14 and then again from 1923-39 and 1947-9, after which he moved to the South of France. The Dutch pioneer of pure abstract painting, Piet Mondrian, settled in Paris in 1920 and Wassily Kandinsky in 1933. The heyday of the School of Paris was ended by the Second World War, although the term continued to be used to describe the artists of Paris. However, from about 1950 its dominance ceded to the rise of the New York School. (Source: Tate Gallery)

Enamel: An enamel paint is a paint that air dries to a hard, usually glossy, finish. In reality, most commercially-available enamel paints are significantly softer than either vitreous enamel or stoved synthetic resins. Some enamel paints have been made by adding varnish to oil-based paint. Typically the term "enamel paint" is used to describe oil-based covering products, usually with a significant amount of gloss in them, however recently many latex or water-based paints have adopted the term as well. The term today means "hard surfaced paint" and usually is in reference to paint brands of higher quality, floor coatings of a high gloss finish, or spray paints.

Engraving: Engraving is the practice of incising a design onto a hard, flat surface, by cutting grooves into it, with a burin (sharp tool).

Etching: Etching is the process of using strong acid to cut into the unprotected parts of a metal surface to create a design in intaglio in the metal.(this is the difference with etching which is gouging out with a sharp tool) This is then wiped clean and covered with ink, then once pressed onto moist paper, the final product is created As an intaglio method of printmaking, it is, along with engraving, the most important technique for old master prints, and remains widely used today.

Expressionism: Expressionism is the tendency of an artist to distort reality for an emotional effect; it is a subjective art form. Expressionism is exhibited in many art forms, including painting, literature, theatre, film, architecture and music. Additionally, the term often implies emotional angst – the number of cheerful expressionist works is relatively small. In this general sense, painters such as Matthias Grünewald and El Greco can be called expressionist, though in practice, the term is applied mainly to 20th century works.