Colorful, I believe that every friend who plays coins is very fond of, especially the top five-color, but also let people fall in love, today talk about the multi-colored package pulp (the original light five-color).
When it comes to colorful bags, many friends now love and hate. Love is because of its variety of colors and charms that make people impressed. Hate, is due to the multicolored packaging pulp now after doing more and more serious situation, so that some friends see the colorful color of the colorful point said that it is the back, true and false is difficult to distinguish. Many friends buy colorful, only the kind of original old bag pulp with colorful dare to start.
Multicolored identification must first look at the edge.
Generally, the formation of multicolored pulp begins to oxidize from the edge, and gradually extends from the edge of the silver coin to the inner circle, so the real old multicolored edges are "all black oil edges".
Some friends will say that what is not black oil edge is not the old multicolor? The answer is not necessarily.
Some old collectors put a silver coin of original light in a booklet, or a brown paper bag, after decades of oxidation, is this considered an old multicolored? This is a matter of benevolence. The picture below is what the old collector has been on the kraft paper tape for decades.
The second color identification is "into the bone".
What I am talking about here is related to the individual's eyesight and the quality of what I see. In layman's terms, it is actually to judge the degree of oxidation of silver coins. Because silver coins are generally placed, or stacked, or placed flat in the belt, the most contact with the air is the edge, so the oxidation of silver coins extends inward from the edge. The silver coins that have really been oxidized for decades will have a very comfortable feeling of unity of money and pulp. If you try a destructive experiment, you can't wipe it off with your fingers. It will not be as impetuous as after doing the multicolor, and the fire is very heavy.
This one is the last multicolor. It can be seen that this ten-year-old paste floats on the surface, and there is no layering inward transition of the edges, and there is no trace of gradual oxidation. The fire is very heavy!
How many colorful colors are there? What color will be the end? An American chemist and coin collector Weimar White is quoted here for his analysis of the pulp.
The slurry (i.e. the discoloration of silver coins, or toning or tarnish in English) is a vulcanization and corrosion process on the surface of silver coins. The chemical composition of the pulp is silver sulfide. The color of the coating depends on the thickness of the silver sulfide: 50 nm thick silver sulfide is yellow, 110 nm thick silver sulfide is blue, and thick is black. The thickness of silver sulfide in gold, red and purple pulp is between yellow and blue.
Different blends of colors may produce other colors, such as yellow and blue mixes producing green. Black is the "ultimate color" of vulcanization.
The edges have been oxidized into black small heads
The slurry is an evolutionary process in which the color gradually changes from yellow to black as the thickness of silver sulfide increases. To maintain the multicolored paste, the process of further vulcanization must be stopped, otherwise the multicolored pulp will gradually turn black.
In fact, analyzing the edges of multicolor can also give us some enlightenment.
As shown in the figure, there is a black-brown paste on the front edge, which is the stage of transitioning to black, after which it will all become black, and then continue to oxidize inward.
In fact, an important factor in judging the old multicolor is to look at the continuity and characteristics of the edge inward oxidation, oxidation cannot be 100% uniform, so there will always be traces of black and brown as shown in the following figure.
Ring color coating pulp, in fact, is the result of this oxidation from the edges inward. Due to the placement problem mentioned earlier, the general silver coin has more ring color, and less full color. Therefore, full color should be more rare, but a good ring color is also super beautiful.
If the part of the coin is pressed tightly, some of the gaps will be larger, and what we call the crescent moon will appear.
In fact, the identification of old colors must be comprehensive, can not be too bright silver color is false, can not be because they have not been exposed to research. It is necessary to synthesize the characteristics of the edge, the bone, and the local to judge. There is definitely a difference between a century of oxidation and a few years and months. As long as you take more physical objects to see and study, I believe that everyone will have their own set of methods for the identification of colorful.