The primary method of stain formation is surface stains, where the staining substance is spilled out onto the surface or material and is trapped in the fibers, pores, indentations, or other capillary structures on the surface. The material that is trapped coats the underlying material, and the stain reflects back light according to its own color. Applying paint, spilled food, and wood stains are of this nature.
A secondary method of stain involves a chemical or molecular reaction between the material and the staining material. Many types of natural stains fall into this category.
Finally, there can also be molecular attraction between the material and the staining material, involving being held in a covalent bond and showing the color of the bound substance.
Read more about this topic: Stain
Other articles related to "formation":
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... As formed the Mobile Division was made up of the 1st and 2nd Light Armoured Brigades, the 1st Tank Brigade, artillery, engineers and signals ... Its paper strength was 620 armoured fighting vehicles, but seven eighths of these were reconnaissance vehicles, and of those some were being simulated by trucks ...
... This provisional government with Dupont de l'Eure as its president, consisted of Lamartine for foreign affairs, Crémieux for justice, Ledru-Rollin for the interior, Carnot for public instruction, Goudchaux for finance, Arago for the navy, and Burdeau for war ... Garnier-Pagès was mayor of Paris ...
Famous quotes containing the word formation:
“The moral virtues, then, are produced in us neither by nature nor against nature. Nature, indeed, prepares in us the ground for their reception, but their complete formation is the product of habit.”
—Aristotle (384322 B.C.)
“... the mass migrations now habitual in our nation are disastrous to the family and to the formation of individual character. It is impossible to create a stable society if something like a third of our people are constantly moving about. We cannot grow fine human beings, any more than we can grow fine trees, if they are constantly torn up by the roots and transplanted ...”
—Agnes E. Meyer (18871970)
“I want you to consider this distinction as you go forward in life. Being male is not enough; being a man is a right to be earned and an honor to be cherished. I cannot tell you how to earn that right or deserve that honor. . . but I can tell you that the formation of your manhood must be a conscious act governed by the highest vision of the man you want to be.”
—Kent Nerburn (20th century)