Hello Mr. Gray,

I very much enjoyed browsing your periodic table website and I would like to commend you on the wonderful work (both on the web and in the wood). I read the section detailing the pair of bromine tubes you purchased from a seller on ebay and the fact that they had the letters 'H' and 'L' written on them and you believed the seller misinterpreted the meaning of the letters to mean High and Low pressure. I remember a demonstration from high school chemistry class where two tubes of bromine were used. One was placed in an ice bath while the other was kept at room temperature. As you pointed out both tubes likely have the same pressure, and as a result when one is subjected to 'Low' temperature the gas in the tube condenses and leaving a liquid in the tube and the "air" in the tube goes clear. A fairly dramatic demonstration that I still remember some 14 years later.

I hope this contributes something to your site, but clearly that is just my interpretation of the 'H' and 'L' to mean 'High' and 'Low' temperature based on the class demonstration I recall.

Cheers,
Graham Fraser

Bromism from excessive cola consumption.
B. Zane Horowitz.
Journal of Toxicology: Clinical Toxicology. 35.n3 (May 1997): pp315(6). (3222 words)

Abstract:
Background: Bromism is an unusual occurrence. Historically bromism has been known to occur with chronic ingestion of bromide salts used as sleep medications. In this case, excessive consumption of a cola with brominated vegetable oil caused a severe case of bromism. Case Report: The patient presented with headache, fatigue, ataxia, and memory loss which progressed over 30 days. He consumed 2 to 4 L of cola containing brominated vegetable oil on a daily basis before presenting with these symptoms. His significantly elevated serum chloride, as measured by ion specific methods, and negative anion gaps were overlooked during a prior hospitalization and emergency department visits. A focal neurologic finding of right eyelid ptosis led to an extensive evaluation for a central nervous system lesion. The patient continued to deteriorate, until he was no longer able to walk. A diagnosis of severe bromism was eventually made and his serum bromide was confirmed at 3180 mg/L (39.8 mmol/L). Despite saline loading the patient failed to improve but subsequent hemodialysis dramatically cleared his clinical condition, and reduced his serum bromide levels. The unilateral eyelid ptosis, a rarely reported finding in bromism, also resolved with hemodialysis. Conclusions: A negative anion gap or an elevated serum chloride should prompt an evaluation for bromism. In this case hemodialysis dramatically improved the patient's clinical condition and reduced the half-life of bromide to 1.38 h.