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.
USDA Equipment Catalog for Fresh and Processed Products Inspections is available on the internet here and provided through:
Processed Products Branch
U.S. Department of Agriculture
P.O. Box 96456, Rm. 0709, So. Bldg.
Washington, D.C. 20090-6456
USDA Visual Color Standards and other equipment related to fruits and vegetables can be ordered from:
Equipment & Forms Depot
USDA, AMS, FVP, SCI
831 Mitten Road, Room 200
Burlingame, CA 94010 USA
Mr. Philips has spent the last 30 years in product development and management, technical sales, marketing, and business development in several industries. Today, he is the global market development manager for HunterLab, focused on understanding customer needs, providing appropriate solutions and education, and helping to solve customer color challenges across these industries and cultures.