British consular revenue stamp used Bogota, Colombia, c

Fugitive pigments are impermanent

pigment A pigment is a colored material that is completely or nearly insoluble in water. In contrast, dyes are typically soluble, at least at some stage in their use. Generally dyes are often organic compounds whereas pigments are often inorganic comp ...

s that lighten, darken, or otherwise change in appearance or physicality over time when exposed to environmental conditions, such as

light Light or visible light is electromagnetic radiation that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 te ...

temperature Temperature is a physical quantity that expresses quantitatively the perceptions of hotness and coldness. Temperature is measured with a thermometer. Thermometers are calibrated in various temperature scales that historically have relied on ...

, humidity, or

pollution Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of any substance (solid, liquid, or gas) or energy (such as radioactivity, heat, sound, or light). Pollutants, the ...

. Fugitive pigments are present in types of paint,

marker The term Marker may refer to: Common uses * Marker (linguistics), a morpheme that indicates some grammatical function * Marker (telecommunications), a special-purpose computer * Boundary marker, an object that identifies a land boundary * Marke ...

s, inks etc., which are used for temporary applications. Fugitive inks which washed away when soaked in water were sometimes used deliberately to prevent

postage stamp A postage stamp is a small piece of paper issued by a post office, postal administration, or other authorized vendors to customers who pay postage (the cost involved in moving, insuring, or registering mail), who then affix the stamp to the ...

s being removed from envelopes by soaking, and reused (e.g., the

Queen Victoria Lilac and Green Issue The Lilac and Green issue is a series of postage and revenue stamps issued in the United Kingdom in 1883 and 1884. The stamps are known as such because they were only printed in those two colours; lilac being used for the d, 2d, d, 3d values and d ...

). While permanent pigments are usually used for

painting Painting is the practice of applying paint, pigment, color or other medium to a solid surface (called the "matrix" or "support"). The medium is commonly applied to the base with a brush, but other implements, such as knives, sponges, and ai ...

s, 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

Painting materials Pigments {{Art-stub