Media used: white gel pen, white charcoal pencil, ink pen and gray marker, over black Zentangle® tile.
More coming soon, including some color!
UPDATE June 20, 2016: I changed the name of this technique to "Glow ON the dark", because I feel it makes a difference between the traditional "Glow in the dark" stickers.
Update June 24, 2016: The ebook is here! Also called "the missing link" in Shading Zentangle: http://enioken.com/3dtangle/glowonthedark
Copyright 2016 Eni Oken