Tri-Art's Primary Liquid Acrylic paints are non toxic, and have low odour. All batches are tested for lead and heavy metals. They will not separate in the jar and have a great shelf life. Formulated to the same high standards you've come to expect from Tri-Art; the Acrylics are made with 100% acrylic emulsion which gives the paints good flexibility and adhesion to surfaces. The colours are created by using real pigments, have very vibrant chroma and are excellent for colour mixing.