Jo Sonja's Artist Acrylic - Phthalo Blue, 2.5 oz tube Phthalo Blue 2.5 oz Chroma’s Jo Sonja Matte Flow Acrylics are medium viscosity acrylics offering the velvety matte finish and rich opacity of color associated with gouache, plus outstanding handling and brush characteristics. Formulated with pure, fine-quality pigments, colors will remain vibrant and true for years to come. - Jo Sonja's Artist Acrylic - Phthalo Blue, 2.5 oz tubejo Sonja Colors, THLO BLU 2.5OZ -