The term ARTISTIC MEDIUM can be broken down into two crossword solutions: INK (3 letters) and TEMPERA (7 letters). INK is a liquid or paste that contains pigments or dyes and is used to color a surface to produce an image, text, or design. Tempera is a type of paint made from pigment mixed with a water-soluble binder such as egg yolk. It is often used in artworks on paper, wood, or canvas. Both INK and tempera are popular artistic mediums used by artists to create works of art.