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Pencil
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Author:shengmingwj
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Published time: 2529 days ago
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Pencil, Is a pen for writing and drawing sketches, dating back more than 400 years. There are many types of sketches of pencils, divided into three stages of development: graphite, wood Pen, pencil cap; In addition, its color red and white, black and white, yellow and black stripes.
Pencil, Is a pen for writing and drawing sketches, dating back more than 400 years. There are many types of sketches of pencils, divided into three stages of development: graphite, wood Pen, pencil cap; In addition, its color red and white, black and white, yellow and black stripes.
Pencil can cause lead poisoning?
Remember that when I first started school with a pencil, we often bite the pencil while thinking about it. In fact, this is not a good habit and may endanger the health.
Is the pencil made of lead?
Pencils are called pencils, and people often think that lead refills are made of lead. In fact, the main material of pencil lead is graphite. Although bite of pencils will lead intake, but its source is not pencil lead.
Where is the pencil's lead?
Lead exists in the paint on the surface of the pencil, in fact, many pigments contain heavy metals, lead oxide, lead and other ingredients are made of paint, different colors contain different heavy metals. Although the content is small, but the stuff with paint, whether it is plasticine, watercolor paint or crayons are heavy metals, so it is best not to import.
Pencil can cause lead poisoning?
Remember that when I first started school with a pencil, we often bite the pencil while thinking about it. In fact, this is not a good habit and may endanger the health.
Is the pencil made of lead?
Pencils are called pencils, and people often think that lead refills are made of lead. In fact, the main material of pencil lead is graphite. Although bite of pencils will lead intake, but its source is not pencil lead.
Where is the pencil's lead?
Lead exists in the paint on the surface of the pencil, in fact, many pigments contain heavy metals, lead oxide, lead and other ingredients are made of paint, different colors contain different heavy metals. Although the content is small, but the stuff with paint, whether it is plasticine, watercolor paint or crayons are heavy metals, so it is best not to import.
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