Rich, found the materials folder, ruby console gave me this path -
Applications/Sketchup2015/Sketchup.app/Contents/Resources/Content/Materials
to get down to materials folder I had to right click Sketchup and select "show package contents"
Driven, I had found the "old colors" folder in the user/library path in my search for the "material" folder.
Now I have what seems to be conflicting info, is it preferred to drop the "suc" texture folders into the "material" folder on the application path per Rich's post or do I create a new "material" folder in the "old color" folder as suggested by Driven?
Rich, Driven I do thank you both for your replies , now I'm just a little confused as which way would be best. as I said in the op I 'm dumb as a brick when it comes to poking around under the hood and don't want to "break" something. thanks, chuck.