

Oil paintings are usually on canvas and the paint dries very slowly. Oil paint is mixed with a chemical called turpentine (instead of water like other paints), and the brushes are cleaned with another chemical, called white spirit. It is not very easy to carry everything you need for oil painting up a mountain to paint the view! Oil paintings are usually done in an artist's studio. Artists might choose to use oil paint because of the rich colours it can create. Oil paint dries slowly because of the oil, and this means that artists can work in a very detailed way, that is not possible with other faster drying paints. Oil paint can be used with a brush to give a smooth flat surface or applied thickly using a pallet knife to give a lumpy, bumpy effect. Many artists use this quality of oil paint in their work.
Other kinds of paint, such as watercolour, gouache, or acrylic paint can be mixed with water, and brushes are cleaned with water as well. Watercolour and gouache paintings are usually on paper and dry quickly.
Watercolour paints are very light and easy to carry around. Watercolour paint is transparent. This means that you can see through it. If you paint blue over yellow in a watercolour painting, you will not see blue, but a shade of green. The yellow shows through the blue and makes a green colour in the same way that yellow and blue paint mixed together in a dish make green. Artists use the transparency of watercolour to achieve the effects they want but the fact that it is transparent also means that it is very difficult to cover up any mistakes! Artists often use watercolours to work quickly and capture a moment.
Acrylic paint was first used in the 1940s. It is not transparent and can be used in a similar way to oil paint.