The trick is to not blend white and black directly on the palette to get intermediate tones, but, just like in a photo or a print, where the dots are only black ones printed on white paper more or less less thickened, in melting them to our brain in order to make us perceive all the shades of gray. So just paint with just black dots on a white background, or with black and white dots on a gray background to achieve a photorealistic effect. This is also the reason why most of the artists of these currents choose to paint large paintings (usually around two square meters), making it easier for them to see and control the brush strokes. But if one wants to realize a small picture as it should do. Well, there are two solutions, either you buy a high-magnifying monocle or choose to use alternative techniques, which are not of the type with a printing effect, but which allow to obtain similar effects. I do not know canonical methods to paint in this way, but I can illustrate my personal method of proceeding if you are content with what you can get (far enough from the photorealistic effect).
We want to introduce the mediums that can be used together with oil colors to get the right color dilution, faster drying, glazing and other special effects. We will try to give you the ideas necessary to know the right materials and to be able to realize the paintings you want.
There are various techniques for cleaning oil paintings. Museum curators often simply use their saliva to soak cotton wool (the common cotton wool) and delicately pass it on the stains in the painting. Avoid the solvents for stubborn stains. We can wet the cotton with turpentine (making sure it does not come off the color) or with a solution of linseed oil and white spirit. To eliminate dust, on the other hand, a clean, soft brush will suffice for a dry cloth or for the more meticulous. Then there are the so-called “grandmother’s remedies” that provide for the use of food and in particular a half white onion to pass on the painting until a patina is formed which will then be removed with a cloth once dry. Or even the use of bread (the crumb above all) as a tea towel to remove small stains and halos. However, oil paintings are very delicate and if you do not have time and / or patience to devote yourself completely to it, you should rely on specific cleaning companies and industry such as EasyFeel, group expert in the cleaning of paintings of any kind and in particular paintings in oil.