Introduction of oil paint

Oil painting oil paint is a special paints, pigment powder from the refueling and mixer grinding. The basic components of oil paints and other paints as the pigment, extender pigment containing reagent and certain excipients such as plasticizers, stabilizers, slow drying agent or driers agent composition. Binding agent
Is composed of resin, drying oil and grease, balms and waxes, but usually used directly linseed oil.
Ratio of the pigment composition and
Usage, subject to pigment  red iron oxide production process, cost, and storage, features, and many other factors, the different nature and different levels of pigment types of the raw material and the proportion of different constituents.
Pigment
Is the main component paints, its quality and the merits of the pigment content is also a major factor in the decision, but also directly affect the oil painting effect.
High pigment
Pigments of high quality raw materials chosen to ensure the purity of the color fastness and durability.
Ordinary paint
General level is used and mixed with a certain proportion of the toner filler, low cost choice of colorant pigment of poor quality, low cost, low filler blended more.
The toner used in addition to the  PVC profile stabilizer previously mentioned painting of the performance, it is important to also consider the toner contained in the oil itself, the diffusion capacity of the toner, i.e., whether the performance of the oil fusion good question.
Containing reagent micro granular pigment color must be a liquid carrier medium to spread and application of liquid paint when dried, this thin film containing reagent to form the pigment particles firmly bonded together and stick to the foundation on.
Ingredient
There are dry vegetable oil in linseed oil, walnut oil, poppy oil, safflower oil and sunflower oil. They are oxidized in air leaving through the dried paint film, after drying oil paint colors and humid almost no significant difference, and this is one of the main advantages paintings.
Auxiliary materials
In addition to the toner and the toner contained in addition, depending on the pigment and the pigment performance specifications, in the production of the pigment is added to a certain proportion of auxiliary materials such as plastic agents, fillers, stabilizers, gloss agents and driers .
Wax, aluminum stearate, etc. can be added to the pigment in the pigment stable consistency and increased plasticity.
Pigment hiding low tinting strength is poor, often used as a filler in a general increase in oil paint. Although fillers will reduce the color purity, but for some colorant is a pigment and can take this improved properties such as thickness and fineness, color film can also adjust the hardness, the pigment is more stable performance and reduce costs.
Some toner slow drying, although the drying may use fast drying, but still need to add cobalt, manganese, lead driers.
Others need to use colorants opposite slow drying oil paint retarder to slow the drying rate. Some oil paint added to the resin used approaches to increase the gloss of the pigment.
The ratio of various materials
The quality and cost of the  titanium dioxide pigment have played an important role, as its technology vendors secrets, so oil paint painter often unable to understand the exact composition of the specific circumstances.
Edit this paragraph performance
Effects and work life
Effects and techniques of oil painting with oil paints work life of the performance has a direct relationship
Oil paint performance
Tinting strength, light power, opacity, transparency, oil absorption, toughness, dryness, plasticity and leveling and so on.
Some of these properties directly affect the painting effect, some will indirectly have an impact, some are related to pigment production.
Oil paints a variety of performance according to different needs through the use of different media agents and auxiliary materials to be adjusted appropriately.
Coloring pigment tinting strength
More simply refers to the diffusion capacity of the pigment, that a certain kind of paint pigments mixed with another baseline after showing the ability of its original color intensity. Usually in white color for other colors benchmarks to measure their coloring. Tinting strength is also one of the main properties of pigment.
The strength of coloring pigments
Mainly by the pigment itself, the degree of light absorption and reflection of the decision, the greater absorption capacity, the stronger coloring.
Toner particle size and dispersion of the pigment is the coloring power.
In the same colors, organic pigment tinting strength generally stronger than inorganic pigments such as violet, red, crimson, and scarlet, etc. Some colors are too strong tinting strength strong bleeding, poor stability of the fatal shortcomings.
When used in a multilayer painting pan bottom color will produce color, it is difficult to be completely covered, so it is best to avoid using these colors, a last resort should be carefully controlled, with the deployment of such a color composite color should be the first added in small amounts , to reconcile uniform, and then gradually increase the dosage.
Edit this paragraph light force
Light force also called Fast force or lightfastness, is the pigment in the sun's ultraviolet radiation to maintain the original color tolerance, in general, inorganic pigments in the light of the role will darken gray hair, organic pigments then fades fading However, the light power sum up, the inorganic pigment is superior to general organic pigments.
Light force is an important indicator of the quality of identification of pigments
Light force test
Xenon light has a dedicated tester can simulate sunlight exposure can greatly reduce test time.
Light power level
Press the light fastness standards are divided into 1-8.
In general, the majority of organic pigments are not lightfast, mineral pigments are light, such as Alizarin red light will gradually fade, and yellowish brown, earth red and quality ultramarine was enduring.
In addition, between the pigment to be compatible with each other, and some paint reconcile because of a chemical reaction to change the hue; There's another color will penetrate the cover color, causing trouble.
Oil paint color lakes raw materials used in the production of rose, violet and pink, etc. are very poor light pigment force should be avoided.
Other red cadmium red and vermilion class except, if a join when there will be a white dilute noticeable fading phenomenon.
In addition, the role of oil, too much oil can cause yellowing darker hue, these are what we should try to avoid.
So some of the paint is easy to reconcile the best selection, fast drying, relatively stable pigment, and try to control the color range in a relatively concise, in order to avoid more accidents.
Many ancient masters are selected so familiar, easily, apply certain types of pigments to freely control, to achieve their goal of painting.
Simple test methods pigment
We are their common pigments can also be used to test the easiest way:
The need to test paint coating on the canvas or board, it is best to make the same kind of paint were painted flat, thick coating, thin coating and processing white dilute test.
Subject to color with black paper to dry up on the half block sunlight exposure, after comparing the results observed after a few months, you will find different colors of light force difference.
Hiding
The optical properties of the pigment determines the hiding power of paint pigment opacity and transparency, when the refractive index of the pigment and the presence of the surrounding medium are equal, the color of which was transparent. And when the pigment is greater than the refractive index of the medium refractive index is generated when hiding, hiding the greater the difference between the stronger.
Determinants of hiding
Pigment light scattering and absorption of the scattering rate is large or the color of a strong absorption capacity corresponding to a strong hiding it.
Hiding is one of the main characteristics of oil paint, oil painting effect opaque and translucent effects are determined by the strength of the pigment hiding.
Oil paint in strong hiding power are white, black, and iron-based pigments.
Transparency and opacity pigments as also determined by its refractive index and reflectivity, but just the opposite, and the former. Good color transparency necessarily weak covering power, and vice versa.
Transparency of the pigment particles but also with the toner weight, dispersion and shape of the crystal.
When painting the transparency of the pigment can be used to cover the method of color forming dye color. In the oil paint, each color hue are the respective relatively transparent, translucent and opaque pigments are available.
Generally, oil paints have better transparency crimson, green, ultramarine blue, ivory black and so on.
For transparent painting pigments containing reagent and color media agent itself should also have good transparency, after the addition of the pigment can make some of the original is not very transparent pigments have some transparency.
Whatever pigments, its transparent and opaque are not absolute, oil paint opacity and transparency is also relative.
The actual number of colors in the painting is in the state of various translucent and transparent and opaque color gamut together to form a rich and subtle contrast.