Ten usages of pencil

2. Make a ruler for drawing lines

Give someone a gift to show their love

When the goods are sold, they make a profit.

5. Broken wood chips can be made into decorative paintings.

6. In the candlelight, your beloved MM is sitting in front of you. You give her a carefully prepared drink. Then, you take out a pencil, unplug the lead, look at her affectionately and say softly, use a straw!

7. Sharpened pencils can also be used as self-defense weapons when encountering bad people.

8. Roll the tape manually

9. Break up and vent your emotions

10. Used to repair mobile phones: Lead in pencils can change the resistance of circuits and original devices.

1 1. Lend it to students without pencils.

12. The last useful practical knowledge: use a pencil to identify the authenticity of diamonds.

When identifying, you need to wet the diamond with water first, and then carve it gently with a pencil. On the crystal face of a real diamond, there is no trace where the pencil crosses, but if it is not a diamond, but a material such as glass and crystal, it will leave traces on the surface.

Generally speaking, pencils are used to identify diamonds. This method has high accuracy. But in the appraisal, we should pay attention to some inlaid old diamond jewelry, which is not suitable for water seepage, because if it is inlaid with copper or silver, it is easy to oxidize. In addition, generally speaking, the crystal plane of diamond also needs to avoid contact with oil.