Graphite pencils: According to GB/T 149-1995, according to their hardness, they are divided into 18 kinds: 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H and 10H. Hard pencils use “H” (Hard for hard), soft pencils use “B” (Black for black), and ordinary hardness use “HB”…
First of all, there is a big difference in blackness between the two pencils. The 2B pencil has a higher blackness, and the marks drawn are relatively black, while the HB pencil has a lower blackness, and the color of the marks drawn is relatively light, which is very different. In addition, the hardness…
1. Different pens. Mark pens are usually round, Mark pens are square and have hard pens. 2. Marking pens are usually oily, and their color is not easy to fall off. Because of their single function, there are few choices of color types and less changes in the pen head. Mark pens are generally…
Oily marker pen, is not soluble in water, but in alcohol, when the pen is dry, you can use a syringe to absorb a small amount of alcohol into the marker pen, and then you can use it. Oily marker pen has strong penetration, which is usually reflected on the back of the paper. And…
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