Coloring Basics

Coloring in a zig-zag motion creates textures.

Coloring in small circles creates evenness.
Color Blending
Making a gradation - Colors used, RV000 BV000
Color with Super Brush nib in sweeping stroke with first color.

While it is still wet, add second color from the opposite side. Lift the pen up at the end of the stroke.
Go back to the first color and blend the border before drying. Add a lot of ink and really soak it by coloring in circles again.
Two Ways to Express a Boundary Line Between Different Colors
Sharp
To make strong contrast between two colors, apply the lighter color in a blending group first and apply the next color after previous color has dried.
Blurry
If you apply the dark color first, the lighter color may blur the boundary line between two colors.