Artificial staining of marble. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Artificial staining of marble. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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What might be needed artificial staining of marble? As you know, all colored varieties of marble are very expensive. In view of this, artificial coloring of cheaper white marble has recently become widespread.

The coloring method is as follows: unpolished marble is laid horizontally and covered with a coloring solution hot enough to still foam. The coloring matter then penetrates deeply into the marble and holds very firmly. The coloring solution is prepared in alcohol. To stain blue, dissolve litmus in alcohol, the amount of the latter being determined by the desired density of color. For yellow color, a solution of gummigut is used. And if on top of the first color (with litmus) put the second one (with gum), then you get an excellent green color.

The root solution of alkanes, cochineal, etc. prepared in this way stains marble red. Finally, a solution in alcohol of equal parts of zinc sulfate, ammonia and verdigris verdigris stains the marble in a golden color. It is possible to make a very effective mosaic from pieces of marble of different colors, painted in this way: in terms of beauty and color strength, it is in no way inferior to a mosaic of expensive marbles, although it is much cheaper.

Author: Korolev V.A.

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The conductivity of the crystal is increased by 400 times 23.11.2013

Scientists accidentally discovered that the electrical conductivity of a crystal increases 400 times if it is exposed to light - using this effect, physicists can significantly increase the capacity and speed of storage devices; the results of the study were published in the journal Physical Review Letters.

Marianne Tarun of the University of Washington and her colleagues conducted a study on strontium titanate. As they worked, they noticed that its electrical conductivity suddenly increased. At first they could not understand what was the matter, and only then found out that the electrical conductivity increased when the crystals were exposed to light.

Then the scientists conducted an experiment: they left the crystals under bright light for 10 minutes, and then removed them into the dark. It turned out that the effect of increasing electrical conductivity lasts for several days - the researchers explain this by the fact that light releases electrons in the material, allowing them to carry more electrical current.

This ability, the so-called residual photoconductivity, has nothing to do with superconductivity - the complete absence of electrical resistance, which physicists can achieve only at temperatures close to absolute zero - Tarun and her colleagues found their effect under normal conditions.

"The appearance of this effect at room temperature opens up new possibilities. In standard computer memory, information is accumulated on the surface of chips or hard drives, and in devices using residual photoconductivity, information can be stored in the entire crystal," said Matthew McCluskey, co-author of the study, whose words are quoted in a message from the university.

This approach has been called holographic memory and is considered a potential replacement for high-capacity data technologies. So, if now on magnetic and optical media data is recorded in one or two layers, then in holographic memory they will be recorded over the entire volume of the device, and the speed of writing and reading information will increase.

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