Judith Baca uses acrylic paint on the Great Wall of Los Angeles over other paints because of the murals size and how she wanted the paintings to look. Fresco painting is a technique that is used on freshly applied plaster. This technique was used to decorate the inside of Egyptian tombs, and was greatly used in Roman culture to decorate interiors and was restored during the Renaissance. The paint is created by mixing the pigment with water and is then applied to a lime-plastered surface. Once the chemical reaction of the pigment absorbing into the plaster occurs it is very durable, making the fresco permanent (Thomas and Hudson 217). Oil paintings were first used during the Middle Ages. Because the oil paint is flexible it attaches quickly