Charcoal is used for initial sketches and outlines when painting as it allows for broad strokes that can be easily erased by gently rubbing with a cloth if corrections need to be made. Oil painting involves mixing pigments with oils as a binder to apply to surfaces like canvas or boards. Graffiti refers to abstract wall paintings and texts meant for unlimited creative expression and disclosure seeking to change and evolve the visual appeal and impact of urban areas. Pastels are powdered pigments mixed with gum or resin to form sticks used directly on surfaces like paper or wood for drawings. Ink can be a liquid or solid that is diluted and used in various colors like black or sepia on paper.