anchor.diff:      /// Creates a Color from the specified color values (red, green, and blue).
       /// The alpha value is implicitly 1. (fully opaque). 
       static member fromRgb r g b =
  -        Color.fromArgb 256 r g b
  +        Color.fromArgb 255 r g b
   
       /// Color from hex representataion (FFFFFF) or (0xFFFFFF)
       static member fromHex (s:string) =
  
positive.code: 
      /// extractor
      member this.Value = obj
      
  
  // http://graphicdesign.stackexchange.com/questions/3682/where-can-i-find-a-large-palette-set-of-contrasting-colors-for-coloring-many-d
  module Table =    
  
      let black       = Color.fromRgb   0   0   0                
      let blackLite   = Color.fromRgb  89  89  89 // 35% lighter
      let white       = Color.fromRgb 255 255 255
  
      /// Color palette from Microsoft office 2016
      module Office = 
      
          // blue
          let blue        = Color.fromRgb  65 113 156        
          let lightBlue   = Color.fromRgb 189 215 238
          let darkBlue    = Color.fromRgb  68 114 196
                      
          // red           
          let red         = Color.fromRgb 241  90  96  
          let lightRed    = Color.fromRgb 252 212 214
  
          // orange           
          let orange      = Color.fromRgb 237 125  49
          let lightOrange = Color.fromRgb 248 203 173
                                                                
          // yellow        
          let yellow      = Color.fromRgb 255 217 102
          let lightYellow = Color.fromRgb 255 230 153
          let darkYellow  = Color.fromRgb 255 192   0
                       
          // green         
          let green       = Color.fromRgb 122 195 106
          let lightGreen  = Color.fromRgb 197 224 180
          let darkGreen   = Color.fromRgb 112 173  71
  
          // grey         
          let grey        = Color.fromRgb 165 165 165
          let lightGrey   = Color.fromRgb 217 217 217
  
      // From publication: Escaping RGBland: Selecting Colors for Statistical Graphics
      // http://epub.wu.ac.at/1692/1/document.pdf
      module StatisticalGraphics24 =
          let a = 1
      // 
      //{2,63,165},{125,135,185},{190,193,212},{214,188,192},{187,119,132},{142,6,59},{74,111,227},{133,149,225},{181,187,227},{230,175,185},{224,123,145},{211,63,106},{17,198,56},{141,213,147},{198,222,199},{234,211,198},{240,185,141},{239,151,8},{15,207,192},{156,222,214},{213,234,231},{243,225,235},{246,196,225},{247,156,212}
  
  
  
  
negative.code:         override _.WriteJson(writer, value, serializer) =       
              let argb = value :?> Argb
              //writer.WriteValue(sprintf "rgba(%i, %i, %i, %0.1f)" argb.R argb.G argb.B argb.A )
              writer.WriteValue(sprintf "rgba(%i, %i, %i, %0.1f)" argb.R argb.G argb.B (float argb.A / 255.))
  
      /// Creates a Argb Color from the four ARGB component (alpha, red, green, and blue) values.
      let create a r g b =
  