Creo Options Modeler > References > Fundamentals > Creo Parametric User Interface > The View Tab > Appearances > Creating Appearances > About Material Appearance
  
About Material Appearance
The appearance of a material is based on information such as:
Color
Highlight
Maps
Reflection
Transparency
The appearance can be defined by color, texture, or a combination of color and texture. For example, you can define an appearance with a color that is covered by a decal, with a part of the decal being transparent so that the color is seen underneath it.
You can specify a color for any part or assembly. If you do not modify the appearance, Creo assigns a default color. A color can be defined through levels of HSV (hue, saturation, and value) or RGB (red, green, and blue). You cannot modify the default color.
 
* When you open assemblies or parts created in Pro/ENGINEER Wildfire 4.0 or earlier that have appearances with Lightworks shaders, a message informs that the appearances on these models will be converted to a new format. You can set the configuration option suppress_appearance_message to yes to disable the message. The default value no allows the message to be displayed.