<prompt> A factory worker presents with excessive salivation, blue line on gums, tremors, disturbed personality, insomnia and loss of appetite. DiagnosisArsenic poisoningLead poisoningMercury poisoningPhosphorus poisoning  <response>: Refer: Rajesh Bardale - Principles of Forensic medicine Toxicology, 1st edition, pg no: 458Mercury poisoning:Chronic Poisoning: Otherwise called as Hydrargyrism.MC poisonous salt of mercury is ChlorideClassic Triad:Gingivitis, Salivation and Tremors.Signs Symptoms:Blue lines on gumsTremors Danbury tremors which starts in hands and then progresses to other parts of the body. When generalized, it is called as Hatters Shake, glassblowers shakesMost severe form called as Concussio mercurialis where no activity is possible.Mercurial Erethism which occurs in worker of mirror industry where there is development of psychological symptomsMercuria lentis is a peculiar eye change where brownish deposit of mercury seen on anterior lens capsule and this is due to exposure to mercury vapor. It has no effects on visual acuityAcrodynia Pink diseaseIdiosyncratic hypersensitivity reaction, seen in childrenGeneralized erythematous, eczematous papular type of lesions mostly in hands feet, accompanied by thickening peeling of the skin.Dimercaprol BAL is used in treatment of mercury poisoning. 