colours ?
It depends on the color of the table cloth!
black
White is a color that will not fade.
The color of white cloth can be changed through a process known as dyeing. Fabric dye molecules bond with the fibers of the cloth to impart color. This can be achieved through various dyeing techniques such as immersion dyeing, tie dyeing, or batik.
You eat it!
It takes the color out of the clothing
Of a dull brownish yellow, or drab color; -- applied to cloth, originally to a stout brownish cotton cloth, used in making uniforms in the Anglo-Indian army. In the United States service the summer uniform of cotton is officially designated khaki; the winter uniform of wool, olive drab. Any kind of khaki cloth; hence, a uniform of khaki or, rarely, a soldier clad in khaki. In the United States and British armies khaki or cloth of a very similar color is almost exclusively used for service in the field.
The cloth would be wite because if it were any other color the colored light would mix with the color of the cloth and make a different color.
Purple cloth on a cross is often used in Christian tradition to symbolize royalty, as purple was a color associated with kings and rulers. It is meant to represent the sovereignty of Jesus Christ as the King of Kings.
Yes. Though most people would say that using a white (a neutral color) alter cloth would be best if you don't have the "proper" color. I personally believe that it doesn't matters what color the alter cloth is, it's more about the intentions behind your spell/ceremony/etc. that matters.
Black and WHITE
Whenever you want a piece of cloth to have a certain color.