Polychromos colour pencil
151 helioblue reddish
Metallics marker
colour ice ice blue
Pitt Artist Pen Brush India ink pen
ultramarine
light indigo
137 blue violet
145 light phthalo blue
Albrecht Dürer watercolour pencil
cobalt blue
skyblue
helioblue reddish
light phthalo blue
Grip Finepen
0.4, helioblue reddish
120 ultramarine
146 skyblue
157 dark indigo
110 phthalo blue
140 light ultramarine
152 middle phthalo blue
247 indanthrene blue
246 Prussian blue
phthalo blue
blue violet
dark indigo