Here are the two lettering techniques Kay (@kaysaratatsu) shared with us using the Koi Coloring Brush pens! Technique1: Apply the ink directly onto the paper. Add another color randomly. Wet the brush with clean water. Rub the surface gently with the brush and blend colors. A beautiful gradation is made! Technique2: Put the ink on a palette. Add water with a dropper and make two different dilution. Paint the first layer with the pale color. Apply the darker color before the first layer dries. Re