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Nascent Drama

To art students, the use of white can present particular problems, and there is at least one training course specializing in the use of white in art.[citation needed]
 
In watercolor painting, white areas are the absence of paint on the paper.
 
There are also speculations about the use of white and other colors.
 
Until Newton's work became accepted, most scientists believed that white was the fundamental color of light; and that other colors were formed only by adding something to light.
 
Newton demonstrated this was not true by passing white light through a prism, then through another prism.
 
If the colors were added by the prism, the second prism should have added further colors to the single-colored beam.
 
Since the single-colored beam remained a single color, Newton concluded that the prism merely separated the colors already present in the light.
 
White light is the effect of combining the visible colors of light in equal proportions.
 
In the science of lighting, there is a continuum of colors of light that can be called "white".
 
One set of colors that deserves this description is the color emitted via the process called incandescence, by a black body at various relatively-high temperatures.
 
For example, the color of a black body at a temperature of 2848 kelvins matches that produced by domestic incandescent light bulbs.
 
It is said that "the color temperature of such a light bulb is 2848 K".
 
The white light used in theatre illumination has a color temperature of about 3200 K. Daylight can vary from a cool red up to a bluish 25,000 K.
 
Not all black body radiation can be considered white light: the background radiation of the universe, to name an extreme example, is only a few kelvins and is quite invisible.
 
While the color of a light source can be reasonably measured by its correlated color temperature, a different approach is required for objects since different samples may appear white without a reference.
 
Thus, assessment of whiteness requires a comparison.
 
The International Commission on Illumination (CIE) prescribes one such method.
 
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