- #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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Discussion Overview
The discussion revolves around the factors and chemical reactions that cause modern paint to change color intensity over time. Participants explore various aspects, including the influence of different types of paint and the effects of environmental exposure.
Discussion Character
- Exploratory, Technical explanation, Debate/contested
Main Points Raised
- One participant notes that the causes of color change depend on the specific type of paint, suggesting a lack of a universal explanation.
- Another participant identifies oxidization due to air exposure and fading from UV light as primary causes of color change.
- A later reply emphasizes that plant-based pigments are generally more photosensitive and prone to oxidation compared to mineral pigments, citing historical examples of color preservation in artworks.
- Some participants suggest looking up "lightfastness" for more information, although this term is humorously questioned in relation to its meaning.
Areas of Agreement / Disagreement
Participants generally agree that multiple factors contribute to paint color change, but there is no consensus on a singular explanation or the extent of each factor's impact.
Contextual Notes
There are limitations in the discussion regarding the specific types of paint and their compositions, as well as the varying environmental conditions that may affect color change.
- #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
- 19,385
- 15,617
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
- 3,638
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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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