are hand blown and have a spiral tip which functions as being a reservoir for ink. The spiral delivers a sizable enough reservoir for your artist to draw across the complete page without needing to major up on ink. Inks like oxgall (produced from oak galls) and bistre (constructed https://collinmcsjx.pointblog.net/not-known-factual-statements-about-how-to-draw-with-ink-pens-79408037