Products bearing the AP seal of the Art & Creative Materials Institute, Inc. (ACMI) are certified non-toxic. A product can be certified non-toxic only if it contains no materials in sufficient quantities to be toxic or injurious to humans, or to cause acute or chronic health problems.
Extend the working time of your acrylic paints with Grumbacher Artists' Acrylic Retarder. This slow-drying additive may be mixed directly into acrylic colors or with other painting mediums in ratios of up to 30% to volume. For the longest drying time, use the maximum percentage of retarder to color or medium.