Chagall Reference   Marker                12.5.93
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   The 'Marker' is a transparent tool (like a
   felt-tip pen) drawing evenly with a sharp edge. 
   This means that this tool will draw only where
   at least one colour component (red, green 
   or blue) is lighter than the marker's colour.

   If the Marker colour has been selected by an 
   <Alternate>-click from the current picture, 
   the painting mode remains transparent.

