办公文具模板

1. Practice "One Finger Zen" wellHold the thumb, index finger, and middle finger slightly away from the pen tip, using the little finger as the support point, with relatively even force and easy co...

Phase 1The birth of graphite: At this time, the "graphite pencil rod" was still in the primitive stage of only being able to write;In 1564, a black mineral called graphite was discovered in a place...

1. Hard colored pencils and soft colored pencilsThe refills of colored pencils are made of wax adhesives (vehicles) in w...

Colored pencil refers to a type of drawing pencil made with colored pigments instead of graphite. This kind of pencil is...

Colored pencils are also divided into two types, one is water-soluble colored pencils (soluble in water), and the other ...

The hardness mark of the pencil lead, generally use "H" for hard pencil, "B" for soft pencil, "HB" for soft and hard lea...