Soot Ink 1oz jar, with wide opening to deep pens or tools. Ziller Inks are perfect for steel pointed nibs, broad edge pens and brushes. They are a multi-faceted medium for wherever your imagination takes you.Flows well from both pointed and broad edged pens, Creates similar looks of gouaches, Water soluble, just dilute with distilled water, Conforms to the “non toxic' ASTM D-4236 labeling requirements and the “no heavy metals” European EN-71-3 Standards.