Writing, Drawing, and Marking Inks

Inks for writing, drawing, and marking materials are mainly based on water. They have a variety of compositions depending on the specific uses and materials. 

Similar to ink-jet inks, aqueous drawing and writing inks contain water miscible cosolvents as humectants or moisturizers (e.g., glycols, glycerin, or sorbitol), which stabilize the ink in the pen and at the nib. Typically, biocides and tensides are added to the ink formulation. 

Fountain pen inks are low in viscosity, exhibit a surface tension within small 

Highly concentrated dyes with very low salt content are preferred. For black inks, dye concentrations up to 8.0 % are necessary to achieve a high optical density. For fineliner pen inks the same ink formulations are used as in fiber-tip pen inks. 

High concentrations of basic dyes or solvent dyes digested in oleic acid or 

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