Fugitive pigment

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.[1][2] 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).

1887 British Consular Service revenue stamp printed in green fugitive ink

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.

References

Field, George (1869). "4". In Thomas W. Salter (ed.). Field's Chromatography or Treatise on Colours and Pigments as Used by Artists (Salter's ed.). London: Project Guttenberg. p. 31. Retrieved March 9, 2014.
Tiarna Doherty; Anne T. Woollett (2009). Looking at Paintings: A Guide to Technical Terms (Revised ed.). Los Angeles: J. Paul Getty Museum. p. 59.

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[1] Field, George (1869). "4". In Thomas W. Salter (ed.). Field's Chromatography or Treatise on Colours and Pigments as Used by Artists (Salter's ed.). London: Project Guttenberg. p. 31. Retrieved March 9, 2014.

[2] Tiarna Doherty; Anne T. Woollett (2009). Looking at Paintings: A Guide to Technical Terms (Revised ed.). Los Angeles: J. Paul Getty Museum. p. 59.