The following story is a chemical mystery with an emphasis on qulaitative inorganic analysis, laboratory observations, and oxidation-reduction processes. This is the 14th article in a series pressenting a scentific problem in mystery format in the context of the popular and beloved characters Sherlock Holmes and Dr. Watson (1.2). There is break in the story where readers (students and teachers) can ponder and solve the mystery. Sherlock Holmes provides his solution in the paragraphs following this break.
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