1. Is the pencil lead poisonous? In fact, the pencil lead is not toxic, lead is toxic, and the main raw material for making the pencil lead is graphite and clay, so the pencil lead is non-toxic. The main components of the pencil refill are graphite and clay. Graphite is a scaly solid with a…
The hardness mark of the pencil lead is generally indicated by “H” for a hard pencil, “B” for a soft pencil, “HB” for a soft and hard pencil, and “F” for a pencil with a hardness between HB and H. Arrangement (from soft to hard) 9B, 8B, 7B, 6B, 5B, 4B, 3B, 2B, B, HB,…
Divided into two parts: pencil cap and pencil rod: the appearance of the pencil cap decoration material is mainly polyester material, and the manufacturing process can be divided into mold making, offset printing, assembly and other processes to complete it. The appearance of pencil pencil decoration materials mainly includes nitrocellulose pencil paint, printing ink, electrochemical…
New pen to hand Generally, the pen can be used normally after it is applied to the water. It is not necessary to take a new blisters as the individual has said. Of course, sometimes it is inevitable that you will encounter a situation where the pen does not have water or the tip of…
When we use the pen, some parameters are not visible. But we can still use some techniques to get the pen good or bad. Let’s take the best-selling pen on the market as an example. A. The tip of the pen can pull out the pen holder and move the pen tip on the white…
There are many types and models of pens. According to the composition of the pen nib, it can be divided into three types: gold pen, gold pen, and ink pen pen. Gold pen The nib is made of gold alloy, the nib is soft, the elasticity is good, and the hand feels comfortable. However, the…
There are two main types: 1. Plug-in gel pen The cap-type gel pens come with a cap. The cap can change various shapes to make the pen of the pen look more beautiful; more importantly, it can protect the pen. 2. Press the 中 type gel pen Pressing the 中-type gel pen is quite different…
One. Ink color 1.Basic color neutral pen The most commonly used ink colors are red, blue and black. 2. Special color gel pen In fact, the water chalk and color ink we use every day belong to the category of gel pens. These gel pens are suitable for paintings, cards, decorations, etc., making our writing…
1.Bullet type Looking closely at the tip of this gel pen, we will find that they are like a bullet. In the manufacturing process, we cut an original rod into a complete tip by metal cutting. The bullet type is suitable for making thicker pens. The market is more than 0.5MM, and the thickest can…
1. Dip the stains into warm water (40 ° C) with benzene or wash with phenolphthalein, then wash with detergent, rinse with clean water (warm water). 2. Soak the stain with cold water, gently wipe with carbon tetrachloride or acetone, then wash with detergent, rinse with warm water. 3. when the smudge is deep, you…