Polychromos colour pencil
146 skyblue
157 dark indigo
110 phthalo blue
140 light ultramarine
152 middle phthalo blue
247 indanthrene blue
246 Prussian blue
Pitt Artist Pen Brush India ink pen
skyblue
Albrecht Dürer watercolour pencil
phthalo blue
ultramarine
blue violet
dark indigo