Fugitive pigment

{{Short description|Impermanent pigment}}

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File:British consular revenue stamp used Bogota, Colombia, c. 1895.JPG

Fugitive pigments are impermanent pigments that lighten, darken, or otherwise change in appearance or physicality over time when exposed to environmental conditions, such as light, temperature, humidity, or pollution.{{cite book|last=Field|first=George|title=Field's Chromatography or Treatise on Colours and Pigments as Used by Artists|year=1869|publisher=Project Guttenberg|location=London|page=31|url=https://www.gutenberg.org/ebooks/20915|edition=Salter's|editor=Thomas W. Salter|accessdate=May 22, 2024|chapter=4}}{{cite book|title=Looking at Paintings: A Guide to Technical Terms|year=2009|publisher=J. Paul Getty Museum|location=Los Angeles|page=59|url=http://www.getty.edu|author=Tiarna Doherty|edition=Revised|author2=Anne T. Woollett}} Fugitive pigments are present in types of paint, markers, inks etc., which are used for temporary applications. Fugitive inks which washed away when soaked in water were sometimes used deliberately to prevent postage stamps being removed from envelopes by soaking, and reused (e.g., the Queen Victoria Lilac and Green Issue).

While permanent pigments are usually used for paintings, painters have made work wholly or partially with fugitive pigments for a number of reasons: availability and cost of pigments; being more concerned with the appearance of colors available only with fugitive pigments than with permanence; lack of knowledge regarding the deterioration of pigments; or the desire to have a painting change in appearance over time.