Old Beauty Buy

I recently stopped in a drugstore and looked at the foundation.  I decided to go back to buying like I used to.  I bought two bottles of the same brand foundation and type.  However one darker shade and one lighter shade.  My complexion is olive so I can wear different shades usually I buy a light beige.However I use a darker shade sometimes for a bronze look. Sometimes ifI feelthat a shade is too dark or too light I mix the two shades together in the bottle.