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.
These are universal lightfast primers for use on a variety of surfaces, including canvas, cotton, paper, and stone. They can be diluted with water, up to a maximum of 20%. Apply them in multiple layers, with 3 to 4 hours of drying time between layers. They're suitable as a primer for acrylics, oils, watercolors, and egg tempera.