ST Professional Artist’Acrylic Color the needs of the professional artist. Has always been concerned with these concentrated acrylics contain rich, pure pigments that produce intense color. Professional Acrylic Color are water-based, quick dring, permanent, and blendable, yet (non-toxic) and safe for everyday use. These acrylic are value price and easy to use, making them an exellent choice for the beginning or intermediate artist. All colors have standard approval by Œ from Europe and ASTM from the United States.