Permalba 150-Ml Artist Oil Color, Phthalo Blue Made from densely concentrated pigments The entire Permalba oil color line is rated as ASTM Lightfastness I, with the exclusion of the iridescent colors which are not yet rated Traditional pigments with low lightfastness have been replaced with contemporary alternatives, giving the artist the same traditional hues so richly prized but with superior color retention Formulated with refined linseed and safflower oils which minimize after yellowing Maximum film flexibility