Color perception is the link between how the human eye perceives color and the way the brain processes that information to affect our moods and choices. Scientific research in the area of color perception has revealed that there is a great variation between how each individual sees and views color, yet our brains continually process this information in relatively the same way. The way that humans perceive color plays an important role on the choices we make, especially when it comes to our food selections.
USDA/AMS is the most general source for visual color standards for fruits and vegetables and offers a catalogue of color comparators and equipment they have available.
The USDA quality system assigns peanut butter quality rating of USDA Grade A, Grade B and Other based on 4 attributes that total 100 points.