Nacre is made of the shell of fresh-water clams, Hyriopsis
cumingii (Lea) and Cristaria plicata (Leach) (Fam.
Unionidae) or peral oyster, Pteria martensii (Dunder)
(Fam. Peteriidae) by calcination after removal of the curticle.
To subdue hyperactivity of the liver, to
calm the nerves, and to improve vision.
Headache, dizziness, fidgetness and insomnia; inflammation
of the eye due to heat in the liver; blurred vision in deficiency
conditions of the liver.
Usage : To
be decocted before other ingredients.