1. First, grind the bought pigment again. You can also buy a small mill of pigments or a western medicine shop to grind as much as you need. Be patient when polishing, and don't be too impatient, so that the pigment temperature is too high and the adhesion is destroyed. To a certain extent, find a hard white paper, pour some pigment powder on it, and breathe gently to see how much is left to hang on the paper. The more hanging, the finer the pigment powder.
It's not that I'm unpatriotic. At present, mineral pigments in bulk are imported from Japan, and domestic brands are better than those of Hangzhou Jiangsi Xutang. Other brands of bulk mineral pigments have various shortcomings such as coarse particles, dim color and poor hanging color. )
2. The preparation of mineral pigments can not be separated from colloidal alum water. Its preparation method is simple, and the key lies in the proper proportion of glue, alum and water. The glue is yellow gelatin, or bovine bone glue, small particles and light yellow (available in pharmacies or chemical stores). The scientific name of alum is sodium benzoate (available in darkroom equipment stores or chemical stores for photography).
The preparation method of glue alum water is as follows: two parts of glue and one part of alum are boiled with boiling water respectively, poured together, and appropriate amount of water is added. Note that alum must be ground into fine powder to dissolve. Glue should be soaked in boiling water, not boiling water, because the adhesion will be weakened if it exceeds 100 degrees.
Generally speaking, to draw a four-foot-three-inch cooked rice paper, you can use two pieces of glue, one piece of alum and half a glass of water on your little finger. The author of specific experience must go through many times in practice to get it.
3. It's time to prepare the paint, depending on whether you do light-colored meticulous painting or heavy-colored meticulous painting. Generally speaking, don't prepare too much paint at a time. You should know that the bone glue (including protein) in the pigment will deteriorate and stink in about three days at room temperature of about 25 degrees, making the pigment unusable. Therefore, it is more appropriate to prepare 3-4 teaspoons of pigment at a time.
A, the light-colored meticulous painting is completely in accordance with the above formula, but the upper liquid should be used when the pigment powder is 80% precipitated. At this time, the liquid contains very fine pigment powder, which is attached to the painting material under the action of alum water. The main feature of light-colored meticulous painting is repeated rendering without stagnation, and always maintains a transparent and elegant effect.
B. Heavy color meticulous painting is the same as above, but the weight of gelatin should be increased. When using, the pigment should be fully stirred, and the most saturated pigment should be directly covered on the painting material with a pen. Due to the limited adhesion of gelatin, it is suggested that when using the prepared mineral pigment, a small amount of propylene or gouache pigment with the same color should be added to the pigment to enhance the thick and mellow effect of the color without hardening and cracking.
Finally, we must pay attention to the storage of pigments and seal them from light if possible. The pigment obtained by pastel meticulous painting should not be used continuously for more than 3 days, because dust and bacteria in the process of use will deteriorate the pigment and affect the effect of the work; Heavy color meticulous painting is not so strict, and it can be used until the pigment has not lost its adhesion and is completely layered up and down.
That's about it. I wonder if you are satisfied?