Multiwfn forum

Dear Prof Lu:
     I want to select color scale transition method for displaying the electron density.
     In Multiwfn 3.8 software, the color transition method is following:
    0  Rainbow with black/white for values exceeding lower/higher color limit
    1  Rainbow
    2  Reversed rainbow
    3  Rainbow starting from white
    4 Spectrum (Pink-Blue-Green-Red)
    5 Reversed Spectrum
    6  Grey (Black-White)
    7  Reversed Grey
    8  Blue-White-Red
    9  Red-White-Blue
  10 Blue-Green-Red
  11 Red-Green-Blue
  12 White-Darkred
  13 Black-Orange-Yellow
  14 White-Dark green
  15 Black-Green
  16 White-Dark Blue
  17 Black-Blue-Cyan
  18 Viridis
  19 Yelllow-Orange-Black

    I want to know how to define a color scale transition method like "individual color A -white-individual color B", for examples, Blue-white-Green, Green-white-Orange, grey-white-iceblue, ...
    Is there a keyword used to define a color scale transition method in the file of "settings.ini"?
   
     Thanks in advance!