Methods and processes for casting lead beads

Materials: Iron pencil together, battery lead, n catties, flour, 2-3 pounds, iron basin, 1 gauze, 1 woodblock, larger plane, good heating tools, let's talk about how to do it, first put flour + water, boil it, lake-like, put the gauze under the iron basin, put the iron pencil together, make a small eye, put the lead in the pencil together, burn it with pliers, and directly flow out from the small eye, about 15cm away from the flour iron basin, pour it round and round, pour it a few times, let the lead sand sink After doing well, use gauze to pull the flour and leak it, wash it, take out the lead sand, pick it off, check off the bad ones, put it on the flat cement floor a few times, it is absolutely OK, it should be big or small, it depends on the pencil closes, the hole and the distance from the flour, and the specific super depends on personal reasons.

There are three ways to identify the authenticity of a coin. First of all, if you touch it with your hands, the real coin feels very concave and convex to the touch, but if the edge of the coin is too smooth, it is a fake. The second is to look at it with the eye, and in general, counterfeit coins have obvious rust or blurred patterns.

In addition, if the above methods are still unrecognizable, you can go to the bank and use the instrument to identify. There is no basis for distinguishing authenticity from sound sounds. So, how do you tell the difference between a real and fake coin?

Experts say that there are two types of counterfeit coins: minted and embossed. The key to identifying a minted counterfeit is to look and listen. Bao Keliang, section chief of the Hangzhou Central Branch of the People's Bank of China:

Due to the addition of lead, it looks black and glossy.

Inadequate. In addition, when you fall to the ground, the sound of counterfeit coins is muffled and not as brittle as that of genuine coins. The embossed counterfeit is not much different from the real one in terms of material, so it is unrecognizable in terms of gloss and sound, so it depends on the pattern on the coin.

Bao Keliang, section chief of the Hangzhou Central Branch of the People's Bank of China: The patterns on the counterfeit coins are relatively blurred, etc. The counterfeit coins seized at the bank counter are basically fake peony coins. Fake peony coins come in a variety of varieties.

The early fake peony coins were cast with inferior alloys such as lead-tin alloys, and the surface of the coins was gray and dark, without metallic luster, the patterns were rough and blurred, the sound was dull, and the magnets could not absorb them; Some counterfeit coins are coated with a layer of metal, which is particularly shiny, but the coating is very easy to peel off. The counterfeit coins that have appeared in the past two years have been improved, and they are made of steel core material embossing, which is highly deceptive and easy to fool. The differences between real and fake coins are:

Fake coins are thinner and lighter than real coins, and some fake coins are about a quarter thinner than real coins; Genuine coins have a regular appearance, with smooth and flat edges, while fake coins are often not very regular and uneven in thickness, especially some of the coin's edges have burrs or unsleek lines, and some have files.

straight stripe road; The real coin pattern is clear, delicate, upright, rich in layers, and strong in three-dimensionality, while the fake coin pattern is blurred, the pinstripe is indistinguishable, and the five-pointed star in the national emblem is clear.

The three-dimensional sense is poor, the tip of the five-pointed star is of different lengths, the top is sleek, and the back is a peony flower.

The veins on the petals are blurred, and the stamens of the peony are blurred; Genuine coins have a soft metallic luster, while fake coins have a white and stuffy metallic color, some of them are also shiny, but their luster is divergent, and some of them are like sand turned out, and the surface of the coin has a sand hole, with a magnifying glass.

Observe it at a glance.

The Faculty of Materials and Textiles, the Faculty of Science, the Faculty of Biological Sciences, and the Faculty of Economics and Management are all science. You can go to the undergraduate admissions website to take a look. If you are interested in filling in the science and technology, its accounting and material textile are still okay.

Different specifications are very different, from 10GPA to 10GPA, first there are product performance requirements, only material specifications are set, and then there is mold design.