Painting involves three main ingredients - pigment to provide color, binders to hold the pigment together, and vehicles to make the paint liquid. Different painting mediums use different combinations of these ingredients applied to various supports. Throughout history, painting techniques and mediums have evolved, from watercolor washes to frescoes, encaustics, tempera egg emulsions, flexible oils, and modern acrylics. Contemporary artists continue experimenting with painting through various approaches and new types of paint.