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How to choose a good pencil?

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  From the lead in the pencil. Generally we use the drawing pencil pencil lead is match well by graphite and clay in a certain proportion, the kneading machine, three roller machine mixing, extruded through the pressure core machine a certain size (such as HB ~ 3 h lead core diameter is 1.80 ~ 2.10 mm) of the lead, the dry heating (50 ~ 150 ℃) and high temperature (800 ~ 1100 ℃) roasting, make its have certain mechanical strength and hardness, made by immersion process. The more graphite, the softer the pencil; The more clay you have, the higher your pencil is. The pencil manufacturer H represents the hardness pencil, and B represents the soft pencil. The bigger H is, the harder the pencil is. The more reflective the lines on the paper are, the lighter the color is. The larger the B, the softer the pencil, the heavier the line on the paper, the darker it is.
  Why do some pencils scratch paper when used? Here is a factor of graphite and clay particles. The larger the granule, the easier it is to scratch the paper. Therefore, sometimes we buy such a bad pencil, because its graphite or clay is not very fine when it is processed, and the granule is bigger.

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