Currently, when I have a part document which has no appearance defined, and I call its IModelDocExtension.GetMaterialPropertyValues, I always get the values

0.792156862745098

0.819607843137255

0.933333333333333

1

1

0.5

0.400000005960464

0

0

which is a grey color.

Is there a way to change the default appearance, so that I will get different values than above? If yes, where and how can I change that?