Most writers outline with regular cans

which is also the subject of most of the pictures and texts in the book

though still transparent like all other watercolors

The satin finish works great when you want some subtle sheen but don't want full-on gloss

The markers are

tombow airpress pen black 0 7mm Money Most writers outline with regularThe Tombow AirPress writes the way most pens can't upside down, straight overhead, on damp paper, or down to 5C because of an internal pneumatic piston rather than relying on gravity to feed ink toward the tip. Every click of the button compresses air inside the chamber, pushing the oil based ink forward under pressure instead of letting it pool or stop flowing whenever the pen tilts or the temperature drops. That makes it a genuinely different tool