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(When used, first grind it in a mortar with vinegar until completely dissolved. Then dry it near fire. Sift it through a fine sieve before use. This substance is extremely hard and difficult to crush. When needed, bake it thoroughly in hot ashes, and while still hot, crush it into powder. Nowadays, people often stir-fry it with vinegar or boil it before incorporating it into medicine, aiming to guide its action into the Blood level.)

[Flavor and Nature]
Bitter, acrid, warm, non-toxic.

[Indications]
Pain in the heart and abdomen. Cold qi caused by Zhong'e (sudden severe illness) and Huoluan (cholera-like disorder). Vomiting of sour fluid. Detoxification. Indigestion. Take with wine prepared as an infusion. Also treats blood and qi stagnation and accumulation in women. Treats Ben Tun (running piglet disease) in men. Breaks up Zheng Pi (masses) and cold qi. Take ground with wine and vinegar. Treats all types of Qi stagnation. Opens the stomach and aids digestion. Regulates menstruation. Resolves blood stasis. Stops pain from trauma and bruising. Stops lower bleeding and internal injury with evil blood. Unblocks stagnant blood in the Liver meridian.

[White Zhan Tan (Sandalwood)]
[Flavor and Nature]
Acrid, warm, non-toxic. Slightly Yin within Yang. Enters the Hand Taiyin Lung Meridian and Foot Shaoyin Kidney Meridian, and circulates through the Yangming Meridian.

[Indications]
Resolves wind-heat swelling and toxicity. Treats Zhong'e ghost qi. Kills parasites. Decoction stops heart and abdominal pain, Huoluan. Ren Qi pain. Grind with water and apply externally to the external genitalia and areas of kidney/lower back pain. Disperses cold qi. Guides Stomach Qi upward to promote appetite. Yige (dysphagia) and vomiting. Additionally, for black spots on the face, wash the area nightly with grain water until red, then apply the ground juice; this is very effective. White Zhan Tan regulates Qi, guiding aromatic substances to the highest regions. It pairs best with citrus fruits, assisted by ginger and jujube, and supplemented by Puerariae Radix (Gegen), Amomi Fructus Rotundus (Suosha), Alpiniae Oxyphyllae Fructus (Yizhi), and Cardamomi Fructus (Doukou). It circulates through the Yangming Meridian, acting above the chest and diaphragm, and between the throat and esophagus, making it an essential herb for regulating Qi. The *Lankavatara Sutra* states that applying white sandalwood to the body removes all heat and distress. Therefore, people in the southwestern regions use various fragrances on their bodies, deriving meaning from this. In the Sui Dynasty, Chan Master Shou possessed exquisite medical skills and created "Five Fragrance Drinks" to help others, including Agarwood Drink, Sandalwood Drink, Clove Drink, Eupatorium Drink, and Nardostachys Drink. All take fragrance as the main ingredient, adding other herbs, possessing flavor, quenching thirst, and tonifying the body. Daoist texts refer to sandalwood as "bath fragrance," stating it should not be burned for offering to supreme deities.

[Purple Sandalwood]
[Flavor and Nature]
Salty, cold, non-toxic.

[Indications]
Rubbed on to treat malignant wind toxins. Ground into powder and applied to Jin Chuang (metal wounds) to stop bleeding, relieve pain, and treat Lin syndrome (dysuria). Ground with vinegar and applied to treat all sudden swellings. White sandalwood is a Qi-level herb, acrid and warm, thus able to regulate Wei Qi and harmonize the Spleen and Lungs, benefiting the chest and diaphragm. Purple sandalwood is a Blood-level herb, salty and cold, thus able to harmonize Ying Qi, reduce swelling and toxicity, and treat metal wounds.