Albrecht Dürer watercolour pencil
light phthalo blue
light ultramarine
cobalt blue-greenish
Prussian blue
indanthrene blue
Goldfaber colour pencil
ultramarine
cobalt blue
helioblue reddish
light blue
Polychromos colour pencil
247 indanthrene blue
246 Prussian blue
151 helioblue reddish