Marie’s Soft Pastel Colored Chalk Color 24
Chalk is not pastel. Chalk is made of limestone or gypsum and compressed into powdered sticks. Soft pastels are made from pure mineral pigments. The same pigments are used in oil paint, acrylics, and watercolor.
Soft pastels are made from pure mineral pigments. The same pigments are used in oil paint, acrylics, and watercolor. The difference is in the type of binder used.
Marie’s Soft Pastel Colored Chalk 24pcs is usually combined with a binder such as gum tragacanth and some water. Compressed into sticks that are typically round or squared, they are picked up with one’s fingers and dragged across different types of surfaces specifically designed for painting and drawing with pastels.
The purity of pastel’s pigment, the fact that there is basically nothing between the pigment and the paper is what gives pastel paintings their luminosity. The pigment is in effect, crystals been spread across the paper. That crystalline formation is what makes pastels “sparkle”.
The lightfastness (the degree to which a pigment fades) is unique to each pigment. Different minerals are mixed together to provide gradations in tones (black added) and tints (white added).
Pastels are the earliest form of painting medium, first used during the ice age. There have been many caves found showing drawings made with pure pigment.