I tried out some silver ink in a dip pen for this tile on black. The silver doesn't show up in the picture - it only looks like white ink. But in person it looks pretty neat. Then I added some white charcoal inside the spiral. Fun to play with!
I'm a big fan of experimenting with a wide variety of materials. (You've probably guessed that though!) I love how the basics of zentangle give me a format to do that!