Oil painting is a pictorial technique in which the coloured matter is obtained from the mixture of the colouring pigment with the oil. This mixture serves to join the different pigments between them and these with the support
the most used oils are flax or walnut.
The colors of the oil are colors obtained from resinous solvents to oil.
Currently, oil colors are sold prefabricated in tubes, although they often tend, over time, to decompose due to an excessive amount of oil and wax that is added to prevent rapid drying.
To achieve more transparent colors and prevent certain dyes, such as white, green and blue, from becoming opaque, it is usually added to the usual fatty oils, which produce a dense and viscous material, some soluble oils, also called essential oils (one of the most used is the essence of turpentine).
Once the paint is finished, it is usual to pass a layer of protective varnish, which can also be used to brighten the color or can be applied between the two layers of color to avoid oil from the top coat, when passing to the lower layer, dry and spoil. The final varnishes, when dried, form a transparent film.
