Substances & Homeopatic Remedies

Mercurius dulcis

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Hydrargyrum chloratum


dulcis = sweet, soft
calomel: kalos (Greek) = fair; melas (Greek) = black.


Traditional name

English: subchloride of mercurius or calomel.
Dutch: kwikchloride or calomel.
German: Quecksilberchlorid

Used parts

Trituration of the substance.


Chemical formula: Hg2Cl2. It must be distinguished from Mercurius corrosivus (HgCl2).


Original proving

Already described by Hahnemann in his MM Pura, but no proving is mentioned anywhere. Allen quotes 18 authors, but no provings.

Description of the substance

Product Identification:
Synonyms: Mercurous Chloride; Calogreen; Mercury Monochloride; Mercury Chloride
CAS No.: 10112-91-1
Molecular Weight: 472.09
Chemical Formula: Hg2Cl2
Product Codes: 1363
Physical and Chemical Properties
Appearance: Heavy, white powder.
Odor: Odorless.
Solubility: Negligible.
Specific Gravity: 7.15
% Volatiles by volume @ 21C (70F): 0
Boiling Point: 384C (723F)
Melting Point: 400 - 500C (752 - 932F) (sublimes without melting)

Causes irritation to the respiratory tract. Symptoms include sore throat, coughing, pain, tightness in chest, breathing difficulties, shortness of breath and headache. Pneumonitis may develop. Can be absorbed through inhalation with symptoms to parallel ingestion.

Toxic! Average lethal dose for inorganic mercury salts is about 1 gram. May cause burning of the mouth and pharynx, abdominal pain, vomiting, bloody diarrhea. May be followed by a rapid and weak pulse, shallow breathing, paleness, exhaustion, tremors and collapse. Delayed death may occur from renal failure.
Skin Contact:
Causes irritaton. Symptoms include redness and pain. May cause burns. May cause sensitization. Can be absorbed through the skin with symptoms to parallel ingestion.
Eye Contact:
Causes irritation to eyes, may cause burns and eye damage.
Chronic Exposure:
Chronic exposure through any route can produce central nervous system damage. May cause muscle tremors, personality and behavior changes, memory loss, metallic taste, loosening of the teeth, digestive disorders, skin rashes, brain damage and kidney damage. Can cause skin allergies and accumulate in the body. Repeated skin contact can cause the skin to turn gray in color. Not a known reproductive hazard, but related mercury compounds can damage the developing fetus and decrease fertility in males and females.
Aggravation of Pre-existing Conditions:
Persons with nervous disorders, or impaired kidney or respiratory function, or a history of allergies or a known sensitization to mercury may be more susceptible to the effects of the substance.