Brewers, honey packers and coffee roasters grade colour with instruments rather than by eye, each on its own scale. These are the published scales, with converters where the maths is defined.
10.0 SRM = 19.7 EBC — Deep gold to amber: The upper half of the pale ale range.
Inside the published colour range of: American Pale Ale (5–10 SRM); California Common (9–14 SRM); American Amber Ale (10–17 SRM).
Extra Light Amber (over 34 and up to 50 mm)
The standard states that colour is not a factor of quality for US honey grades (Grade A, B, C are scored on other factors). Colour designations are a trade description. Honey also darkens with storage and heating, so a designation describes the sample when tested.
Roasted coffee is graded with a reflectance instrument against tiles numbered from light to dark; a higher number is a lighter roast. In one study, roasts sold as light, medium and dark read about 58 (light), 48 (medium), 38 (dark).
There is no universally accepted industry definition of light, medium or dark roast, and different roast analysers report on different scales, so a number on one device may not match the same number on another. Tile comparisons are made on ground coffee under controlled light.