Handmade Neon Ready to Use Inks! Perfect for all kinds of dip pens. Inks with an amazing body, and texture, and where all the shades stand bold. Neon inks glow in dark under the UV light. Please note that none of the blue colors in the world glow under UV light. We have named the inks Ninjas. These are just magical. These can also be diluted as per the user's convenience and can also be used for painting.