One look: Generally, the new seeds have a brighter color and the old seeds have a darker color.
The second chewing: After removing the seed coat from the new seeds, it is chewed in the mouth and tastes fragrant and brittle. The Chen seeds have a light and astringent taste, and they feel soft when chewed and have no brittleness.
Three touch: touch the new, old seeds have different feelings. Putting his hand into the seed pile, the new seeds feel cool and smooth, while the Chen seeds feel dry.
Four news: Through the difference in the odor of new seeds, you can judge the new seeds. After the new seeds were handcuffed, there was a scent of fragrance, but Chen seeds were not.
Five cuts: First immerse seeds in warm water, wait until they absorb enough water (that is, to reach the cotyledon layer), and then use a sharp blade to cut through each side of the grain and observe the color and oil gland of the cross section of the seed, if the color is not bright, the oil glands Black is a species of Chen.
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