Gorgeous in colour, Blue Apatite is a striking mineral that is rarely used in jewellery due to its relative softness. As an artist's pigment, though, it's fantastic - a dense, rich midnight blue that granulates magnificently on cold- or hot-press papers. Within a wash, nuances of colour are revealed, from inky near-black to rich Prussian-like blue. Create a stormy sky in one juicy stroke! Light fastness: Excellent Non-Staining Granulation: Yes Transparent.