I’ve had these types of pen before. With a paint pen, ‘calligraphy’ refers only to the shape of the soft tip, and not to an actual calligraphy pen (which is of course metal and sharp for using ink). There is no difference in paint color, just tip style.
Volunteer mod- I'm here to help! Email me for the best response: nambroth at gmail.com
My art: featherdust.com
