If you like Posca, you'll like the Sharpie Poster Paint Marker- the ink is very similar. Great for marking glass, chalkboards, mirrors and especially good for poster projects in school.
Vibrant color stands out on light and dark surfaces. Exceptional for marking windows with advertisements. Will wash off non-porous surfaces like glass with window cleaner. Available in 12 colors. Non-toxic and acid-free. Safe for use by children.