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Can a pencil lead poisoning?

Source: Time:2018-09-26 19:27:08 views:

Will long-term use of a pencil lead to lead poisoning? This question often bothers some people. In fact, people who have this problem tend to think that lead in pencil lead and lead in pencil lead to lead poisoning. So, does lead contain lead? To answer this, we have to start with the origin and development of pencils.
Will long-term use of a pencil lead to lead poisoning? This question often bothers some people.
In fact, people who have this problem tend to think that lead in pencil lead and lead in pencil lead to lead poisoning.
So, does lead contain lead? To answer this, we have to start with the origin and development of pencils.
In the 16th century, a black mineral called graphite was found in a place called Borrowdale in England. Soon, some of the local shepherds found that they could draw marks on the sheep with graphite.
Inspired by this, large pieces of graphite are cut into small strips for writing and painting, but the graphite strips are easy to smudge and break easily. In addition, pure block graphite is very rare.
Later, a German scientist in nuremberg developed a method for preparing graphite strips using powdered graphite.
He added sulfur, antimony, and rosin to the graphite powder, and then heated the mixture to solidify it and pressed it into the shape of a pen, which was the earliest prototype of the pencil.
At this time, only two countries in the world can make pencils. The two countries cut off the supply of pencils to France after napoleon's invasion of neighboring countries.
What if the French don't have a pencil? One of napoleon's armies was called Nicolas Jacques Cont? After trial and error, he finally found a new way to make pencils. He mixed the graphite with clay and put it into the oven to make a very durable pencil lead in the world.
This method is more durable than the original graphite block, and this method can be applied to any graphite ore, changing the dependence of pure block graphite.
This method has been used to the present day, and we see the H (hard pencil), B (soft pencil) and HB (mild and moderate pencil) on the pencil, which actually indicates the hardness of the pencil core. The amount of clay mixed in graphite is different, and the hardness of the lead pencil is different, and the color is different.
The problem of the pen core is solved, so when the wooden pole coat outside the core of the pen is added?
It is said that in the early 19th century, the United States of Massachusetts, a man named William Monroe (William Munroe) of carpenters to lead with wooden coat, he carved on a tree grooves, then embedded a pencil lead, then spell two sticks together, make the coat with a wooden pencil, since then, and many people on the manufacturing process for ink and ink embedded is improved, the pencil became what we currently use.
See here, can anybody again have another question: pencil production process, is useless to lead this kind of metal, so why do they call it a pencil, rather than "graphite pen"?
This is because in the early days of the graphite was found to be s, chemistry is very immature, the subject of graphite lack of accurate understanding of this new thing, they say their findings lead ore, and the graphite named "lead ore".
In this way, a pen made with "lead ore" naturally becomes a "pencil," and the ambiguous name is adopted in many languages such as German and Irish.
Truly understanding the essence of the graphite is later, with the continuous development of natural science, it was found that the black, slightly greasy substance is composed of layers of carbon accumulation, and it and diamond or "relatives", both elements are carbon, just different arrangement of carbon atoms of diamond, it is also make the two color, hardness and other properties the root cause of the big gap.
Since lead is free of lead, is it safe to use a pencil?
Some people often have their pencils in their mouth when they are using a pencil, or even two. In fact, for those who have the habit of biting a pencil, pay more attention and break the bad habit.
This is because the pencil bar outside general, painted with colorful paint if the paint contains trace amounts of heavy metals and other harmful substances, these harmful substances will often in the process of biting into the man's mouth, then swallow the belly.
In summary, there is no lead in the lead pencil, so the correct use of the pencil will not lead to lead poisoning.

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