Amalgam (chemistry) with copper. A nitric acid solution of salts under investigation is applied to a piece of copper foil, and any mercury ions present will leave spots of silvery-coloured amalgam. Silver ions leave similar spots but are easily washed away, making this a means of distinguishing silver from mercury. The redox reaction involved where mercury oxidizes the copper is: Dental amalgam has been studied and is generally considered to be safe for humans, though the validity of some studies and their conclusions have been questioned. Amalgam (chemistry) An amalgam is an alloy of mercury with another metal, which may be a
A Murder Is Announced text is necessary if a correct solution of the mystery is to be arrived at before the astute Miss Marple unmasks the culprit." The review concluded, "Miss Christie has several surprises up her sleeve besides the main one, and (this much may be said without spoiling the reader’s pleasure) she once again breaks new ground by creating a weak and kindly murderer who is yet responsible for the deaths of three people: that such a character should, in the last analysis, seem credible, is a tribute to the author’s psychological acumen and originality of concept." Maurice Richardson, in the 4