Pitt Artist Pen Brush India ink pen
ultramarine
ice blue
cobalt blue
light indigo
phthalo blue
skyblue
Albrecht Dürer Watercolour Marker
dark indigo
indanthrene blue
Ecco Pigment Fineliner
0.1 mm, blue
0.5 mm, blue
0.7 mm, blue
0.3 mm, blue