albedo :2. The white, spongy inner lining of a citrus fruit rind.

pith: 1. tissue under rind of citrus fruits: the soft whitish fibrous tissue that lies under the outer rind of a citrus fruit.
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pith and albedo are synonyms?

Albedo:
ratio of light reflected from a surface," from L., lit. "whiteness," from albus "white". Albedo is more commonly used in astronomy and meteorology and reflectance in physics.

whiteness:
In nature, the color white results when transparent fibers, particles, or droplets are in a transparent matrix of a substantially different reflective index. Examples include classic "white" substances such as sugar, foam, pure sand or snow, cotton, clouds, milk, etc. Crystal boundaries and imperfections can also make otherwise transparent materials white, as in the case of milky quartz or the microcrystalline structure of a seashells. This is also true for artificial paints and pigments, where the color white results when finely divided transparent material of a high refractive index is suspended in a contrasting binder. Typically paints contain calcium carbonate and/or synthetic rutile with no other pigments if a white color is desired.
rutile is a minaral composed primarily of titanium dioxiide, TiO2. Used for making wonderful, opaque titanium white paint.

All I know as a painter is that white is one of the most fascinating 'colours' to use. And that it hightly reacts to any neighbouring colour. Any movement in a white surface of whatever
substance changes the shades. There is no just one white colour , but countless shades of white. The optical illusion of a part of a white sheet of paper , enclosed within a different colour or shade, appearing whiter than the paper itself is well known , but it still is magic to me.

White is wonderful to work with.





Last edited by BranShea; 04/16/2007 3:41 PM.