We use Blender Pens on camp projects to blend colors in a more controlled, less sloppy manner than using Aqua Painters. Blender Pens are moist, not dripping wet. Color moves with more difficulty than with Aqua Painters, but you have more control.
Store Blender Pens on their side, so that both tips stay moist.
After using, clean the tips by wiping them on scratch paper or your Grid Paper until you no longer see any color. Tips will stain from some ink colors. Before using them, it’s a good idea to wipe the tip to make absolutely sure there’s no color on the pen. Then pick up the color from a palette, a crayon, or the lid of an ink pad and color away!