- #1
Superposed_Cat
- 388
- 5
What compounds,reactions and factors cause modern day paint to change hue intensity over time? Any help appreciated.
What causes paint to change colour over time?
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SUMMARY
The primary causes of paint color change over time are oxidization due to air exposure and fading from ultraviolet (UV) light exposure. Modern paints exhibit varying degrees of lightfastness, which refers to their resistance to fading when exposed to light. Plant-based pigments are generally more susceptible to these changes compared to mineral pigments. Historical examples illustrate this, as 19th-century Japanese woodcut prints often show significant color fading, while 15th-century Persian miniatures retain their vibrancy.
PREREQUISITES- Understanding of oxidization processes in materials
- Knowledge of UV light effects on pigments
- Familiarity with lightfastness and its significance in art preservation
- Basic concepts of pigment types, specifically plant-based vs. mineral pigments
- Research the concept of lightfastness in modern paints
- Explore the chemical processes involved in oxidization of pigments
- Investigate the differences between plant-based and mineral pigments
- Learn about preservation techniques for historical artworks
Artists, conservators, art historians, and anyone interested in the longevity and preservation of painted artworks.
- #2
Borek
Mentor
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I guess it depends on the paint, so you won't get a "one size fits all" answer.
- #3
Superposed_Cat
- 388
- 5
Pick any you know the most about,
- #4
- 19,378
- 15,612
Oxidization due to exposure to the air and fading due to exposure to UV (sunlight, even indirect) are the two primary causes.
- #5
Superposed_Cat
- 388
- 5
Thanks
- #6
DrDu
Science Advisor
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Google for "lightfastness".
- #7
Drakkith
Mentor
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DrDu said:
You sure that's not a description of the speed of light?
- #8
epenguin
Science Advisor
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Borek said:
phinds said:
And broadly pigments of plant origin will be more photosensitive and oxidisable than 'mineral'' pigments so typical Japanese woodcut print of the 19th century the colours will be faded, whilst in a Persian miniature in a book of the 15th century they will be almost like new.
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