Buckwheat flour contains a high percentage of fat, and flour will become rancid if stored for long periods. Grading standards consider kernel size and a No. 8 slotted sieve is used. At least 80 per cent of the kernels must remain on top of the No. 8 sieve, or the sample is considered small-seeded, i.e. Canada No.1 Small. Also, degree of soundness is judged. The sample must be well matured, cool and sweet to meet the Canada No. 1 grade.
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