Van Gogh Oil Pastels- Color: cerulean blue (phthalo)- Color code: 535.7Van Gogh Oil pastels contain a binder of mineral oils and waxes.They are available in a wide variety of colors Each color sold separately in a three-inch stickThe last number in the color code indicates the tone of the pastel Color swatches also reflect these differences in tone.3 = mixing shade with black.5 = full shade.7/.8/.9 = mixing shade with an increasing amount of white