味苦。微咸。性大寒。无毒。禀至阴之气而生。降也。阴也。茎叶同用。
【主治】主疗时气头痛。大热口疮。（别录）治温疫寒热。（甄权）治热毒风。心烦闷。
渴疾口
目）伤寒
【归经】入心胃二经。为解散热毒之品。（二经泻热主药）
【前论】李象先曰。阳毒则狂斑烦乱。以大青、升麻。可回困笃。楼全善曰。大青能通
解心
【禁忌】经疏曰。此乃阴寒之物。止用以除天行热病。不可施之虚寒脾弱之人。
味咸。性寒。无毒。此即染淀瓮上沫紫碧色者。市肆以干淀充之。便有锻石。宜水飞
淘净锻石。其淀。乃蓝与锻石作成者。气味与蓝稍有不同。而止血拔毒杀虫之功更胜于蓝。
蓝叶汁。即生蓝叶可以染青者。如一时不得。以青布浸汁亦善。
【主治】主消食积。（丹溪）主泻肝。散五脏郁火。解中下焦蕴蓄风热。吐咯痢血。小
儿
惊
止
吐衄血。金疮血闷。除烦止渴。女人产后血晕。小儿壮热热疳。（大明）〔青布〕解诸物毒。
天行热毒。小儿丹毒。并渍汁饮。烧灰敷恶疮。（医鉴）
【归经】入肝经。为除热解毒之品。（兼能凉血）
【前论】丹溪曰。蓝属水。能使败血分归经络。安常曰。诸蓝性味皆不甚远。故皆能杀
虫除
【禁忌】经疏曰。凡血症。非血分实热而由阴虚内热。阳无所附。火气因空上炎。发为
唾咯
[Da Qing / Indigo Naturalis (Stem and Leaf)]
Bitter, slightly salty. Cold in nature. Non-toxic. Born from the qi of extreme yin. Descending. Yin in quality. The stems and leaves are used together.
[Maintaining Health] Primarily treats headache caused by epidemic qi, high fever, and mouth ulcers. (*Mingyi Bielu*) Treats alternating chills and fever caused by warm epidemics. (Zhen Quan) Treats wind-heat toxin, mental restlessness, thirst, and cold damage syndromes.
[Meridian Tropism] Enters the Heart and Stomach meridians. It is a substance that resolves heat and detoxifies. (The principal herb for clearing heat in these two meridians.)
[Preliminary Discussion] Li Xiangxian stated: In Yang toxicity syndromes characterized by mania, macules, and mental confusion, Da Qing and Sheng Ma can rescue critical conditions. Lou Quanshan stated: Da Qing can unblock and resolve Heart... [text cuts off].
[Contraindications] Miao Xiyong in *Bencao Jing Shu* stated: This is a yin-cold substance, used only to eliminate epidemic heat diseases. It should not be applied to individuals with deficiency-cold and weak Spleen function.
[Qing Dai / Indigo Naturalis (Processed)]
Salty. Cold in nature. Non-toxic. This refers to the purple-green foam floating on the surface of dye vats. The market often substitutes it with dried sediment, which contains lime (Duan Shi). It is advisable to purify the sediment by washing away the lime using the water-flying method. This sediment is made from Indigo plants and lime. Its flavor and nature differ slightly from raw Indigo leaves, but its efficacy in stopping bleeding, extracting toxins, and killing parasites is superior to that of Indigo.
Indigo leaf juice refers to the juice extracted from fresh Indigo leaves capable of dyeing blue. If unavailable at the moment, juice soaked from blue cloth is also effective.
[Maintaining Health] Primarily eliminates food stagnation. (Zhu Danxi) Primarily drains Liver fire, disperses pent-up fire in the five Zang organs, resolves wind-heat accumulated in the middle and lower Jiao, treats hematemesis, hemoptysis, dysentery with blood, pediatric convulsions... [text cuts off]. Stops epistaxis and other bleeding, treats traumatic injuries with blood stasis, relieves irritability and thirst, treats postpartum blood dizziness in women, and high fever or heat-type malnutrition in children. (Meng Shen) [Blue Cloth] Resolves various toxins, epidemic heat toxins, and pediatric erysipelas; drink the soaked juice. Burn to ash and apply topically to treat malignant sores. (*Yi Jian*)
[Meridian Tropism] Enters the Liver meridian. It is a substance that clears heat and detoxifies. (Also cools the Blood.)
[Preliminary Discussion] Zhu Danxi stated: Indigo belongs to Water, enabling damaged blood to return to the collaterals. An Chang stated: The flavors and natures of all types of Indigo are not far apart, thus all can kill parasites and remove... [text cuts off].
[Contraindications] Miao Xiyong in *Bencao Jing Shu* stated: For any blood disorders, if they are not due to excess heat in the Blood level, but rather due to yin deficiency with internal heat, where Yang has no anchor, and fire flares upward due to emptiness, causing spitting and coughing... [text cuts off].