Pitt Artist Pen Brush India ink pen
ultramarine
ice blue
cobalt blue
light indigo
phthalo blue
skyblue
Albrecht Dürer watercolour pencil
helioblue reddish
middle phthalo blue
Pitt Pastel pencil
light ultramarine
dark indigo
Polychromos pastel
blue violet
light phthalo blue
Prussian blue
indanthrene blue
Polychromos colour pencil
120 ultramarine
144 cobalt blue-greenish
137 blue violet
146 skyblue
143 cobalt blue