INK
Mixing soot with water is the most basic way to create a material for writing or drawing. Ink has been used for thousands of years to record history in the form of words and pictures. Pen and ink may focus on lines, while brush and ink allows the liquid to flow.
Ink
In fine art, the term 'pen and ink' denotes a drawing technique involving the use of black and other coloured inks which are applied to a support (generally paper) with either a dip pen or a reservoir pen. This traditional, versatile media has been used by Western artists since ancient-Egyptian times, for sketches, finished drawings or ink wash paintings. It is also one of the main mediums involved in book illustration.
Pens have a metal nib attached to a wood or bamboo holder. When dipped into liquid ink, a slit in the metal pulls the ink into a reservoir.
Anonymous. Stadspoort. ce. 1590 - 1599. Pen and ink. Rijksmuseum
Technique
Ink has many different uses. The main quality of ink is that it is fluid. This allows an artist to chose to drip or fling inks at a surface. Let them soak in or blot them up. The application also can be much more controlled through the use of a pen which controls the amount of ink and the quantity of how much is released.
This pen and ink drawing by Darele Bisquerra was done using Rapidograph brand ink pens which exist in a range of thicknesses and line widths. The botanical subject matter is treated with a casual precision, yielding a magical, dreamlike quality to the finished work.
https://watercolorpainting.com/drawing-materials/
Technique. Garden. Calendar Illustration.1989. Pen and ink. Darele Bisquerra
https://www.societyillustrators.org/exhibits/retrospective.