Acrylic ink is created by mixing acrylic pigments with an acrylic polymer emulsion. This type of ink dries quickly and has a glossy end, with higher pigment concentration for strong colour saturation. The Crow Quill will make the thinnest strains I do know of beyond a Rapidograph. It's a scratchy https://www.youtube.com/watch?v=4O_bQ3Iitxg