Chagall Reference   Brush                 12.5.93
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   The 'Brush' paints opaquely with an even structure. 
   Its shape is round and the intensity (amount
   of paint applied) reduces towards its edges. 
   One of its characteristics is that the intensity 
   of its action is reduced the longer you paint 
   (like a real brush running out of paint).

   If the maximum intensity has been selected for
   the brush then the background will be covered  
   with the selected colour; otherwise multiple 
   application of the tool will be necessary to  
   achieve this.
