text: particles may at times play a rather more signiﬁcant role. When the diffusion of the particles is 
  
  slow, the evaporative dewetting fronts become transversely unstable and may result in strongly 
  
  ramiﬁed patterns. This instability is caused by the nanoparticles. The lower their mobility, the 
  
  stronger the ﬁngering effect, i.e., there are more ﬁngers in (c) than in (d) because in the latter the 
  
  mobility is larger. 
  
  The front instability is intriguing as it results in strongly branched structures. As the dewetting 
  
  front moves, new branches are continuously created and existing branches merge at the moving 
  
  contact line. However, the mean ﬁnger number in the streamwise direction of the resulting ramiﬁed 
  
  pattern is a constant. This behaviour is in contrast to the front instabilities found for dewetting 