Naked Science Forum

General Science => General Science => Topic started by: katieHaylor on 22/05/2018 09:30:37

Title: How does strong sunlight cause colours to fade?
Post by: katieHaylor on 22/05/2018 09:30:37
Mervyn says:

Strong sunlight fades strong colours (i.e. painted surfaces &/or fabrics etc). How does light do this? Do the photons of light actually abrade the colours?

What do you think?
Title: Re: How does strong sunlight cause colours to fade?
Post by: RD on 22/05/2018 09:57:33
Energy from the photons is transferred to the electrons which form the chemical-bonds in the dyes, see ... https://en.wikipedia.org/wiki/Photodegradation
https://en.wikipedia.org/wiki/Photodissociation
Title: Re: How does strong sunlight cause colours to fade?
Post by: evan_au on 22/05/2018 11:06:58
The huge range of colors available today in paints and clothing are largely due to organic dyes.
The colors are often due to double bonds in the chemical structure of the dye.
These double bonds can be broken by ultraviolet light, which degrades the color.
Title: Re: How does strong sunlight cause colours to fade?
Post by: rami999 on 18/08/2018 23:45:22
the energy from the photons is transferred to the electrons which this way, form the chemical bonds in the dyes