There have long been controversies about innovations which might have been introduced by the van Eyck brothers, Jan and Hubert, or secret recipes which they used to advantage in their remarkable works.
Most recently these have been examined critically by Noëlle Streeton, in 2013, Archetype Publications.
When a more flowing or mobile quality is required by the artist, a liquid painting medium such as pure gum family) and bleached hog bristles.
Both come in numbered sizes in each of four regular shapes: round (pointed), flat, bright (flat shape but shorter and less supple), and oval (flat but bluntly pointed).
Red brushes are widely used for the smoother, less robust type of brushstroke.
The painting knife, a finely tempered, thin, limber version of the artist’s palette knife, is a convenient tool for applying oil colours in a robust manner.
So for the time being, there appears to have been isolated use of some form of mixed medium oil painting in Bamiyan, Afghanistan, around 650 AD.
Unfortunately Vasari’s account, translated into English, remains popular and influential today.
We are often led to believe that oil paints were invented in Northern Europe, shortly before the first famous painters of the Northern Renaissance used them to such great effect.
Not only is that untrue, but a more accurate account has been in the public domain for over 200 years.
For once the Classical world of the Greeks and Romans does not seem to have been there first.
Although they did experiment with the use of non-drying olive oil, there does not appear to be any evidence of drying oils forming the medium for any early Mediterranean paintings.