The authors themselves are quite good at checking

Ink base: Ultra-fluid alcohol-based dye ink — glossy

Every pencil in this set is certified under the ASTM D-6901 international standard

boosting existing inks

Suitable surfaces: Watercolor paper

hand mixed solid paint marker fat rainbow HM The authors themselves are quiteWater based 25 mm fat version of HAND MIXED's classic multi colored industrial markers. Just like the original, the lines from these markers turn into different colors as you draw or write; if you simultaneously twist the pen a little, you get maximum effect. The color is opaque but does not work on glass or transparent surfaces. You can see in the picture here which color combination this pen has, and you can see all our pens and products from HAND