The oil colors have different pigment densities, which are symbolized by stars. Five stars stand for the highest and a star for the lowest pigment density and this in turn is responsible for the saturation and the opacity of the color.
At the same time, however, the pigment density also determines the consistency of the oil colors, because the higher the proportion of the color pigments, the firmer and tougher the oil color. The commercially available oil paints can basically be painted directly from the tube, but you can also dilute or thicken the oil colors.
Again, the trade offers a number of different mediums. So you can dilute oil paints by mixing them with turpentine, which is now also available to buy low in odor. The turpentine is added in the amount in the oil paint until it has reached the desired consistency.
At the same time, thinned oil paint can be treated with the aid of turpentine, or redelensed already dried paint to a certain degree, the turpentine does not affect the drying time. In addition, you can dilute oil paints with Malölen herbal origin. For example, linseed oil, sunflower oil, poppy seed oil, hemp oil or walnut oil are used and these oils not only dilute the color, but also extend the drying process. However, traditional oil paints can not be diluted with water and animal oils are also unsuitable because they would cause the oil paints to never completely cure.
An exception here, however, are water-soluble oil paints, which correspond in terms of properties as far as possible oil paints, with respect to the instructions and the advantages but are comparable with acrylic paints. In addition, oil paints can be mixed with drying accelerating media, these so-called siccatives are available as resins or as an oxidation accelerator.