Chameleon Art Products, Chameleon Colorless Blender Pen DOUBLE-ENDED PEN - With a Bullet and Brush nib containing the same colorless Toning Medium used in the Mixing Chamber of Chameleon Color Tones. ADD TEXTURE AND PATTERN - Use over any color to add texture and patterns. SPECIFICATIONS - Use to overlay, lighten or continue blending already applied color. FIX MISTAKES - Use this pen as a liquid eraser to push color back inside the lines and help eliminate mistakes. LONG LASTING - Keep your pens top notch with our replaceable nibs and refillable inks.