Many people love to read. Their reading matter could be a book, a newspaper or the latest issue of Chemistry Review. Although electronic devices can provide convenient access to texts, printed copies are still very popular, and these pages themselves provide some interesting chemistry.
Printing ink is made up of a pigment dispersed in a solvent. It is the pigment that gives the ink its colour. This pigment can be either an inorganic or organic (carbon-based) molecule. A pigment is insoluble and forms a suspension in the solvent, which could be water or an organic liquid. When the ink is pressed onto paper, the solvent evaporates, leaving the pigment bound to the paper.
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