Default layer colors

[DaveSouthern]

When you load a layer - say a shapefile - into a map, a default color is set for the map.  This color will change if you subsequently unload and reload the layer.  Is there any logic that determines what color is selected for the map layer, or is it totally random?

[AhmedEl-Sisi]

You can change default symbology settings such as Default Color Ramp or Marker Size using "Advanced ArcMap Settings dialog box".
You can find this tool under "C:\[Arcmap Install directory]\Utilities"
For a single symbol you can save a style with name similar to Layer name and it will be the default symbology every time you load the layer in Arcmap.


Check this for more information:
http://support.esri.com/es/knowledgebase/techarticles/detail/20880