Why does dust appear black on white stuff and white on black stuff ?

Answer 1

Because it is lighter then black and darker then white. Mostly it is dirt or skin.

Answer 2

Dust comes in all shades, but is generally greyish or brownish. You don't notice the black dust on the black stuff, or the white dust on the white stuff. The in between dust looks darker against a white background and lighter against a dark background.

It is one of those things intended to make your life more exciting if you want to wear black or white clothes. Gives you something to worry about at weddings and funerals.

Answer 3

It is the contrast in colours that causes this! Dust is a rough surfaced mixture of materials. It's most likely colour is grey. Thus it appears lighter than black and darker than white. It's the contrast you are seeing, not absolute colours.

Answer 4

It reflects the light when it's on a black surface, which absorbs light, making the dust appear lighter. On a white surface, it absorbs light, while the white reflects it, making it seem darker.

Answer 5

because it is a gray and the back ground colour makes it look black on white or white on black. Next time look at it as it come out of the hoover.

Answer 6

Because it's a shade of grey containing both white and black , and it's appearance of being either black or white is relative to the background it is on. (more white than black appears white, more black than white appears white)

Answer 7

I think it has to do with reflection. Like there is a hole bunch of colors in dust because they come from the particles of clothing and your skin nd stuff. Kinda like plants and stuff.

Answer 8

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Answer 9

Dust is a general name for minute solid particles with diameter less than 500 micrometers (otherwise see sand or granulates) and, more generally, for finely divided matter. On Earth, dust occurs in the atmosphere from various sources: soil dust lifted up by wind, volcanic eruptions, and pollution are some examples; airborne dust is considered an aerosol and can have a strong, local radiative forcing on the atmosphere and significant effects on climate. In addition, if composed of a flammable substance (such as flour), under some circumstances it can be an explosion hazard.

Dust is responsible for the lung disease known as Pneumoconiosis, including black lung disease that occurs among coal miners. These have resulted in a number of laws regulating environmental standards for working conditions.

House dust
A sample of house dust and hair
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A sample of house dust and hair

The dust which collects in houses is composed of atmospheric dust combined with dust generated by the inhabitants, mostly from sloughed skin cells. It can be removed with a broom, dusting cloth, vacuum cleaner or by a swipe of one's hand.

A variety of technology has been developed for the purpose of removing accumulated dust in the house. The air filter is frequently used on inlet of the air ducts to trap dust. These can be supplemented by air purifiers, including devices that employ ionization to trap dust particles. Accumulated dust is collected by means of devices such as dusters and vacuum cleaners.

House dust mites, often found in fibers like carpets and beds, feed on the organic components of house dust. Their feces, in turn, become part of house dust and can provoke allergic reactions in humans.

Dust in outer space

Dust is also widely present in outer space, where gas and dust clouds are primary precursors for planetary systems. The zodiacal light, seen in the sky at night, is produced by sunlight reflecting off particles of dust in orbit around the Sun. The tails of comets are produced by emissions of dust and ionized gas from the body of the comet. Dust also covers planetary bodies, and great dust storms are produced on Mars that can cover nearly the entire planet. Interstellar dust is found between the stars, producing diffuse nebula and reflection nebula.

It is thought that dust samples returned from outer space could tell scientists much about the early conditions in the solar system. Several spacecraft have been launched in an attempt to gather samples of dust and other materials. Among these was Stardust which flew past the comet Wild 2 in 2004 and landed a capsule filled with remains of the comet back in the US in January 2006. The Japanese Hayabusa spacecraft is attempting a sample return of dust collected from the surface of an asteroid.

Answer 10

simple really. what you see is a mixture of dark and light dust. only on black surfaces you can only see the light dust and on light surfaces only the dark dust shows up.!!