Official Grain Grading Guide
Domestic mustard seed: Classes
Domestic mustard seed is classed as yellow, brown or oriental, or mixed. The class forms part of the grade name; for example, ‘Domestic Mustard Seed, Sample Canada Yellow Account Heated’.
| Class | Colour | Approximate size | Shape | Surface |
|---|---|---|---|---|
| Yellow | Light creamy-yellow to yellow; occasional seed is light or yellowish brown | 2 to 3 mm in diameter | Spherical or oval | Textured, similar to an orange peel, hilum area–small white spot on a deep yellow to light tan circular area |
| Brown | Reddish-brown to dark-brown | 2 mm or less in diameter | Spherical or oval | Predominant netting, ridges are thicker than oriental mustard, hilum area – white on a black or darker brown circular area |
| Oriental | Predominantly yellow to dark-yellow, with some seeds ranging from light brown to brown | 1.2 to 2.0 mm in width, 1.6 to 3.0 mm in length | Oval | Predominant netting, not as predominant as brown mustard, ridges are fine, hilum area – white on a darker yellow to lighter brown circular area |
| Mixed | Yellow and brown mustard seed containing less than 90.0% of one class. See also Domestic mustard seed, oriental: Other classes (OCL) | |||