Thursday, 31 January 2008
UVA / UVB
This is an old drawing from 2003, which I've just given a fresh coat of paint to (i.e. added colour). I'd already shaded it in grey, so I've added colour in a way that will still show this texture underneath. It was from an advert for sunglasses in case you can't guess (which ones, I'm not sure).
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The UVA and UVB can all damage collagen fibers and thereby accelerate aging of the skin. Both UVA and UVB destroy vitamin A in skin which may cause further damage. In the past UVA was considered less harmful, but today it is known that it can contribute to skin cancer via the indirect DNA damage. It penetrates deeply but it does not cause sunburn. UVA does not damage DNA directly like UVB and UVC, but it can generate highly reactive chemical intermediates, such as hydroxyl and oxygen radicals, which in turn can damage DNA.
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Furthermore, both UVA and UVB rays are responsible for the fading of artworks. Works which have very fine layers of pigments or dyes, such as pastels, watercolours or prints, are particularly prone to fading. The UVA rays cause serious long term damage penetrating deep into artworks while UVB rays quickly bleach and burn surface colours.
From (plain) nathan
A most informative blog this is.
Thanks Vishwanathan for providing such useful info about uva and uvb light hazards for skin.
I think uvb light is more dangerous for skin because most of the people use this narrow band rays for the treatment of different skin disorders like vitiligo.
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