Many oils require extensive chemical or physical refinery processes to make them palatable. Cold-pressed canola oil does not, and settles after pressing, allowing large particles to settle, then is filtered four times. Most refined oils have almost no smell or taste.
Unrefined oils are “WHOLE” oils and their colour, flavour and smell are more pronounced. They are like unrefined whole grain flours because they are more nutritious and can have a shorter storage life.