Colored Pencil is water soluble and non-water soluble.

Non-water soluble oil based and wax based. Water-soluble and water-soluble color lead, as its name suggests, can be dissolved in water to produce water-like effects. Need to paint on watercolor paper, if you use plain paper, the paper will wrinkle after watering, affecting the appearance. One of the advantages of using a water-soluble pencil is that if you don't line up, the strokes you draw are always messy, then you can try to use water-soluble lead, because after you dissolve it, you can't see the brush, just see your color. Another point is that you don't have to buy a large number of water-soluble pencils in a variety of colors, because the color can be re-water soluble to produce a fine new color, and can not see the effect of the color. Of course, it is necessary to practice more to create new colors in a stack of colors. It is not a matter of time to accurately reach the desired color. One of the things to pay attention to in water-soluble color lead is that after water-soluble, it is necessary to wait for the paper to dry before stacking, so if you want to draw a lot of layers, the progress will be very slow, and it will be difficult to draw additional details after water-soluble. So I don't think it's very suitable for painting super-realistic works (because super-realistic works tend to be layered, and each layer is fainted to achieve a photo-accurate color effect). But if it is to paint children's drawings or to make handmade creative works, it would be more appropriate. Another point is how to handle the pen when it is dissolved. It is also very stressful. Otherwise, the relationship between the good and the bad may be destroyed.

Oily oily pencils can of course not be smudged with water, but it does not mean that blending is not required with oily pencils. In order to achieve a uniform and beautiful color effect, most of the real-time writing will still use other media to mix colors. These media may include paint thinners, baby oils, and the like. The cotton swab is mixed with baby oil to mix the color. Because it is oil, the oil can be seen behind the paper, and the baby will be stained with baby oil if it is not careful. Another point is that after the baby oil, it can no longer be stacked. So I don't like this method. The effect of using the thinner is very good, and it will dry quickly. After drying, it will not affect the color mixing. The problem is that the diluent has certain toxicity. When using it, I try to keep my hands on it, open the window, and wash my hands after use. If you want to draw more attention to detail, you need to draw with a sharper pen end, so we will hope that the refill is harder, so it is more convenient and less convenient to stop the pencil. The oily pencil lead will be harder than the wax, so it is very dominant at this point.

The waxy wax color mixing method is the same as oily one. The most familiar one is the American brand of Prismarcolor (and Derwent, but less often used by artists). The wax core is soft and easy to break. I was thinking about it at the time, the price was not low, and it was easy to break the core... I still don’t want to burn this money, so I have not used wax. However, according to experienced painters, the advantages of stencil refills are that they are easy to color, especially for large areas, and are also very suitable for drawing out of focus. The disadvantage is that because the core is soft, the nib is easy to be blunt, always cut, and it is easy to break the core. The second is that the number of layers that can be stacked is not as good as that of the Faber-Castell green box.