Pencil
At that time (Barrodale) shepherds often used graphite to mark sheep. Inspired by this, people cut graphite blocks into small strips for writing and painting. Soon, King George II simply took the Barrodale Graphite Mine into royal ownership and designated it as a royal patent. Writing it with graphite strips will both make your hands dirty and break easily. In 1761, the German chemist (Farber) first solved this problem. He rinsed the graphite with water to turn the graphite into graphite powder, then mixed it with sulfur, antimony, and rosin, and then formed this mixture into strips. This mixture is much tougher than pure graphite strips and is less likely to stain hands. This is the earliest pencil.
In (1564), in a place called (Barrowdale) (England), people discovered a black mineral-graphite. Because (graphite) can leave traces on paper like a pencil (the traces are much darker than lead traces), people call graphite "(black lead)".
Until the end of the 18th century, only two countries (Britain and Germany) in the world could produce this kind of pencil. So after Napoleon Bonaparte started a war against his neighbors, (Britain and Germany) cut off the supply of pencils to France, so (Napoleon Bonaparte) ordered the French chemist (Comte) to Find (Graphite Ore) in your own land, and then create (Pencil). However, the quality of the graphite ore in France was poor and the reserves were small, so Comte mixed clay into the graphite and roasted it in a kiln to make the best and most durable pencil lead in the world at that time.
In 1761, the German F. Castel founded the Faber Castel Pencil Factory in Nuremberg, using (sulfur, antimony, etc. as binders and heating and mixing graphite to make lead cores)
p>Generally, "H" represents a hard pencil, "B" represents a soft pencil, "HB" represents a pencil with moderate hardness and softness, and "F" represents a pencil with a hardness between HB and H. Graphite pencils are divided into 18 hardness levels: 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H, 10H. The number in front of the letter The larger the number, the harder or softer it is respectively. In addition, there are three grades of soft pencils: 7B, 8B, and 9B to meet special needs such as painting. Colored Pencils Pencils with colored lead. Lead core is composed of clay, pigments, talc, adhesives, greases and waxes. Used to mark symbols, draw, draw charts and maps, etc. Color pencils are usually packaged in sets (6, 12, 24, 36, 64 colors). Special pencils include glass pencils, color-changing pencils, charcoal pencils, drawing pencils, watercolor pencils, pastel pencils, etc. Each of them has its own special purpose.
You can use the above information to write questions. If you don’t understand, you can ask me again and I will correct it for you