I have made 2 configuration of same part file of different material,Copper and Brass.Interestingly in those configuration,material are showing different as should have..but the apperance colour are showing the same.We know that brass and copper are of seperate colour..but in both configuration eithe it is showing brass colour or copper colour..depend on which configuration i change the material latest....if the material is different why would the colour remains the same in different configuration?