Pfund scale

A scale used in the honey industry to describe the color of honey. Measurements were originally made with the Pfund color grader, which consists of a wedge of amber-colored glass next to a wedge-shaped cell which is filled with honey. The instrument is read visually; the reading is the distance the wedge must be moved to make a match, and is expressed in millimeters.

Honey Colors¹
Color Name Pfund Scale,
millimeters
Optical Density
Water White <9 0.0945
Extra White 9 – 17  0.189
White 18– 34  0.378
Extra Light Amber 35 – 50  0.595
Light Amber 51 – 85  1.389
Amber 86 – 114  3.008
Dark Amber >114
A few examples of Honey Colors
Honey Varietal Average color as mm Pfund
Citrus 14
Eucalyptus 58
Heather 96

Color is not a factor in determining grades of honey in the United States, but a color designation usually accompanies the grade. The Pfund color grader “is not the officially approved device for determining color designation when applying these United States grade standards for the color of honey.” Instead, transmittance is measured at a wavelength of 560 nanometers, through 3.15 centimeters of a freshly-prepared caramel-glycerin solution that matches the color of the honey, as compared with the transmittance of pure glycerin.The optical density², as given in the last column in the table above, is log to the base 10 of 100 divided by the percent transmittance.

1. From Table 1. United States Standards for Grades of Extracted Honey. USDA, Agricultural Marketing Service. Effective May 23, 1985.

2. AOAC.
Official Methods of Analysis. 15th edition.
Arlington, VA: AOAC, 1990.

Section 985.25 See also:
J. W. White, Jr.
Instrumental color classification of honey: Collaborative study.
Journal of the AOAC, volume 67, number 6, page 1129 (1984).

resources

Photographs of a Pfund color grader are shown on this blog:

http://morethanhoney-blog.de/imkerei/the-pfund-color-grader/

The Pfund color grader is no longer made. It was formerly manufactured by the Koehler Instrument Co. of Bohemia, NY. They apparently currently manufacture a sophisticated electronic instrument for measuring the color of honey, but we have not been able to find a model number. Their web site:

www.koehlerinstrument.com

photo of instrument

Courtesy Hanna Instruments

Hanna Instruments manufactures the battery-operated HI83221 Honey Color Analyzer, which reads directly in mm Pfund (± 2 mm at 80mm), roughly 400USD.

www.hannainst.com/usa/prods2.cfm?ProdCode=HI%2083221&id=009003

 

Alternatively, products are available that rely on visually comparing the color of honey in a standardized cup with printed color samples, like the color chips in a paint store:

www.beekeepingstarterkit.com/product/M00598

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