Thomas R. Rybolt, Thomas G. Waddell
A story describing a chemical mystery with an emphasis on scientific observation and the criminal use of classic reaction of chemistry is related. This is the seventh article in a series presenting a scientific problem in mystery form in the context of the popular and beloved characters, Sherlock Holmes and Dr. Watson. There is a break in the story where the reader (students and teachers) can ponder and solve the mystery. Sherlock Holmes provides his solution in the paragraphs following this break.
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