I agree w/Isis and Brooke. Pretty much as long as it is not processed utilizing solvents, the quality of the oil should be very good.
Here's some info on expression/extraction methods:
Cold Pressed - A method of mechanical extraction where heat is reduced and minimized throughout the batching of the raw material. This helps the oil maintain its original state, constituents, and depth. Temperatures are rigorously controlled to insure that it does not exceed 80-90 degrees Fahrenheit. Although not a practical method of extraction for all vegetable oils on the market it is highly regarded as the extraction method of choice.
Expeller Pressed - A method of natural, mechanical extraction and processing of oils where a small amount of heat is produced simply through the frictional heat created by hydraulic presses. This is usually around 120-200 degrees Fahrenheit and makes the oil suitable and economical as a base for cosmetics because of its fairly undisturbed molecular state. It also makes a fine food grade oil.
Refined - A fully processed oil where it has been exposed to high temperatures as high as 450 degrees Fahrenheit, winterization as low as -10 degrees, deodorization (the removal of content which gives an oil its natural scent), and other forms of refinement that will alter its color, depth, and scent. This makes for an economical oil in cosmetics and body care products but it is not the healthiest as a food grade oil.
Caveat emptor: Refined oils may also be extracted with the use of solvents, extracting mediums or other chemicals.
Unrefined - A process of mechanical extraction and screen filtering where no additional refining process has taken place. This ensures the finest quality product and makes the oil the most exquisite for food and cosmetic preparation. The unrefined process helps oil retain a rich, strong flavor and color that is true to its natural state. Unrefined oils are always darker in color and richer in scent.
From this it's clear that if you have a castory oil product w/out a scent, it's been refined. Same may be true as far as the color is concerned.
Unrefined & cold pressed would be my first choice for any oil including Shea butter, coconut, EVOO, and castor oils.
Ps. that info came from
Botanical.com