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Guides on grading and quality of Chinese herbal slices — how to read quality signs, grades, and cuts across different herbs.

How to choose Dong Quai (Angelica sinensis / Dang Gui) — judge oil content and aroma, read head, body and tail grades, spot sulfur treatment, and know what to check before ordering in bulk.
How to choose astragalus root slices (Huang Qi) — read the cross-section, spot sulfur treatment, understand grades and cuts, and know what to check before you buy in bulk.