- #1
Superposed_Cat
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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?
In summary, modern day paint can change hue intensity over time due to factors such as oxidization and exposure to UV light. The level of lightfastness can also vary depending on the type of pigment used.
- #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
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Pick any you know the most about,
- #4
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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
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Thanks
- #6
DrDu
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Google for "lightfastness".
- #7
Drakkith
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DrDu said:
You sure that's not a description of the speed of light?
- #8
epenguin
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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.
1. Why does paint fade over time?
Paint fades over time due to a process called photodegradation, which is the breakdown of paint molecules caused by exposure to light. The UV rays in sunlight are particularly harmful to paint and can cause the pigments to break down, leading to fading.
2. Can temperature affect the color of paint?
Yes, extreme temperatures can cause paint to change color. Heat can cause paint to dry out and become more translucent, making the color appear lighter. On the other hand, cold temperatures can cause paint to become more opaque, making the color appear darker.
3. Does the type of paint affect how quickly it changes color?
Yes, the type of paint can affect how quickly it changes color. For example, oil-based paints tend to be more resistant to fading than water-based paints. Additionally, the quality of the paint and the pigments used can also impact how quickly it changes color over time.
4. How can I prevent paint from changing color over time?
To prevent paint from changing color, it is important to choose high-quality paint with good UV resistance. Additionally, using a primer before painting can help protect the paint from UV rays. It is also important to properly maintain and clean painted surfaces to prevent dirt and grime buildup, which can contribute to color change.
5. Can paint change color due to chemical reactions?
Yes, paint can change color due to chemical reactions. For example, exposure to chemicals in cleaning products or household chemicals can cause paint to discolor or change color. It is important to avoid using harsh chemicals on painted surfaces to prevent this type of color change.
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