Similar to Ultramarine Blue, Permanent Blue offers a more transparent color with a deeper masstone. Grumbacher Academy Acrylics is a line of 48 brilliant process colors, metallic and iridescent colors, as well as the most sought after traditional colors.  All colors have an ASTM lightfast rating of 1- Excellent. Academy Acrylics are highly pigmented and have superior tinting strength, but at a student price.  Available in 90ml metal tubes and 75ml & 200ml plastic tubes. Made in USA.