article_snippet: Speaking to Mail Online, Janssens said: 'It might be that this can be interpreted as an indication of a low quality minium, but this is not certain. '
article_snippet: Janssens said: 'The presence of plumbonacrite in paintings or painters materials is very scarce. '
article_snippet: Janssens said: 'We know of several in which minium is present at the surface.'