The resulting marks would adhere firmly to the vellum or parchment, and (unlike india ink or other formulas) could not be erased by rubbing or washing.
This watercolor peeks through thick oil stick and India ink which form windows in the shape of big heads, whimsical writing and characters from farm days past.
She also created subtle, circular, black and white compositions by manipulating India ink or watercolor on wet paper, often affixing collage elements cut out of white paper.
Carbon black is used as the black pigment in printing ink, artist's oil paint and water colours, carbon paper, automotive finishes, India ink and laser printer toner.
In order to make these marks appear clearer to the projectionist, the punched film is most often inked after punching by application of India ink, or a similar ink.