Polychromos colour pencil
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
dark indigo
light ultramarine
cobalt blue-greenish
middle phthalo blue