The distinction of black gold sand, how to distinguish the truth of sand gold

Real black sand is neutral, shiny, and has a significant ratio, and is one of the better bottom sand for aquariums, which is more expensive. The black sand on the market is impersonated with asphalt, charcoal, stone coloring, etc., which is relatively cheap, but harmful to aquatic plants. Compared with the characteristics of black sands, it can be identified from several aspects:

Clean the floating soil on the surface of the black sand, soak it with boiling water, and sterilize it by the way, and the improvement is fake;

2. Soaking with strong acids such as "toilet cleaner" and bubbling to cause a chemical reaction is fake; 3. Burn with fire, flammable is fake;

4. Use an axe to pound the black sand, fragile and powdery basically determine that it is fake, and then use the above steps to test, and finally determine the true or false.

After the above 4 steps, if your black sands does not have the above "symptoms", congratulations, it is basically certain that it is true, even if it is fake, it will not have much effect on the water. But it should be noted that even if it is a real black sand, it needs to be equipped with base fertilizer and black water to maintain the necessary fertilizer and weak acidity of the grass tank, the real black sands is neutral (don't believe the weak acidity that JS says), and the other: the market is not more than 3 yuan catty, less than 1 yuan catty, basically fake, do not consider.

It is recommended not to buy "black gold", it is OK to buy neutral silica sand if you have silver, or directly on the mud.

Marble black sand is calculated by the yellow (gold point) on the surface of the stone**, the larger the point, the more expensive, basically divided into small, medium and large** also from low to high.

Black sand is a mineral detritus that accumulates by seawater. If the number of accumulations is very large, a beach can be formed. The sand is black or dark in color, mainly because of the dark color of the heavy minerals washed out.

On the beach, the energy of the waves carries away the less specific gravity minerals, leaving only the weathering and abrasion-resistant heavy minerals on the beach. These heavy mineral deposits may be iron ore, cassiterite, zircon or rare metals.

It contains a variety of minerals and is relatively heavy in iron. There are also rare metals, but what they contain depends on the region.

He is also a crystal, worthless.

The color of gold is the most typical golden yellow, and the same is true of sand gold.

Here's a general way to identify gold:

1. Look at the color. **It is seven green, eight yellow, nine purple and ten red. It means that the gold content of blue-yellow is 70, the gold content of yellow is 80, the gold content of purple-yellow is 90, and the gold content of reddish yellow is almost 100.

2. It can be compared with hardness and burned with fire. Red gold has the smallest hardness, pure gold Mohs hardness is, you can bite out marks with your teeth, and you can scratch lines with a pin; Real gold is not afraid of fire, and when it is burned in the flame, it is still golden, and other metals oxidize and change color as soon as they are burned. The sand gold does not change color when burned.

3. Scrub with water, the color of the sand gold inside and outside is the same, it is okay to scrub with water, there will be no fading, and the gold plating will fade.

The difference between domestic black sand and imported black sand sand.

This kind of color is more suitable for families, villas, and can also be used for small stores, handwashing stations, food processing areas, or tables.

The imported black gold sand (mainly imported from India) has relatively large gold points, and there are few small flowers. This kind of decoration is more suitable for large-scale projects and large hotels.

Even if it is a raw plate of the same quality, the imported one will be about 1 2 more expensive. The import of ordinary large slabs is about 430 per square meter, while Anhui, Guangdong and Western Black, is about 280-330. The slab is one that is not cut, and if you cut it, it depends on your specifications, especially the thickness and width (because of the loss of material involved).

Generally, the thickness of the imported plate is not more than 3 cm, and it is difficult to achieve it if there are special requirements. The domestic specifications can basically be satisfied.

Hardness, luminosity.

Domestic, slightly harder. The other luminosity, ciphers, and chemical resistance are basically the same.

Black sand is granite, and the thickness of home improvement stone on the market is generally between 1cm. There are gold dots on the surface, and the gold dots are divided into large, medium and small, and there are gold dots on the back and side of the authentic black golden sand, which is more obvious after being wet with water. If it's dyed, it's not.

Authentic black sand is still black after polishing, and it will fade after dyeing and polishing.

The board is black, with copper-colored grains on it, and the smallest ones are the size of millet grains, and the medium grains are the size of large rice grains, and the larger ones are the size of small fingers.