Concentrated means more color. All Liquitex Medium Viscosity Concentrated Artist Colors are 100% acrylic polymer-based artists' grade and nontoxic. Decorative artists get as much as twice the coverage of other craft paints for most surface applications. A much smoother, fluid consistency than the high viscosity colors. It is especially applicable for tole and decorative arts, stenciling, glazing, water color and tempera techniques, fabric painting, and more. They thin, mix and clean with water. They dry rapidly, after which they are water insoluble. They do not yellow with age. The result is permanent, durable and brilliant color. Apply to most non-oily surfaces including canvas, paper, fabric, board, film, glass, ceramic, masonry and wood.