Beneath the dermis lies the hypodermis or subcutaneous tissue. It supports skin with nutrients, attaches skin to the underlying muscle and acts as a cushion for skin.
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Qing Dai San – Topical Application to Suit Common Skin Conditions
Qing Dai San is not a blue colour even though its main ingredient is Indigo. Why is this so? Indigo is insoluble in water, alcohol, or ether but is soluble in chloroform, nitrobenzene, and concentrated sulfuric acid.