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The classification of pencils can be divided into graphite pencils, colored pencils and special pencils according to their nature and use. Stone
ink pencil pencil leads pencil with graphite as the main raw material. It can be used for drawing and general writing. Graphite
the hardness mark of pencil refill is generally used as "H" to indicate hard pencil, "B" to indicate soft pencil, and "HB" to indicate
A pencil with moderate hardness, "F" means a pencil with hardness between HB and H. Graphite pencil is divided into 6B,
5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H
there are 18 hardness levels such as 9H and 10H. The larger the number before the letter, the harder or softer it is.
In addition, there are 7B, 8B and 9B3 grades of soft pencils to meet special needs such as painting. Color
pencil lead colored pencil. Pencil refill made of clay, pigment, talc powder, adhesive, grease and wax
etc. Used to mark symbols, draw, draw charts and maps, etc. Colored pencils is usually a complete set
(6,12,24,36,64 colors) box. Special pencils includes glass pencil, color changing pencil
, charcoal pencil, drawing pencil, watercolor pens, pastel pencil, etc., each of them has its own special purpose.
① glass pencil: Lead the core consists of pigment, grease and wax. Used in glass, metal, enamel,
ceramic, leather, plastic, organic glass and other surfaces are written or marked for industry, medicine, national defense,
used by departments such as survey. There are red, white, orange, light yellow, purple, dark green, light blue, black and other colors.
② color changing pencil: Commonly known as copy pencil. Pencil refill contains dye such as sun-resistant green lotus lake for writing
the eraser cannot be wiped off. It is suitable for writing important documents that have been kept for a long time and recording accounts. There are green lotus, red and blue
, green, yellow and other colors, mostly pale purple. ③ charcoal pencil: also known as carbon pencil. Pencil refill made of clay
, charcoal powder, carbon black, etc. Used for painting and oil painting base. ④ printing pencil: also known as tracing pencil
. Graphite pencil refill is treated with red dyes such as oil-soluble wax red to block light and can be directly exposed after drawing.
Figure. ⑤ add acid dyes such as water-soluble acid red to watercolor pens: pencil refill. Pencil refill when wet with water, just like
same as watercolor, used for photo coloring, sketching, mapping, statistical charts, etc. ⑥ pastel pencil:
pencil refill made of pigments and porous soft raw materials (such as calcium carbonate), without grease and wax. Its hardness
it feels similar to writing chalk. Used for painting.