2) Fehling's solution. The Columbia Encyclopedia, Sixth Edition. 2001
...The substance to be tested is heated with Fehling's solution; formation of a brick-red precipitate indicates the presence of the aldehyde group. Simple sugars (e.g.,...

3) urinalysis. The Columbia Encyclopedia, Sixth Edition. 2001
...Urine is initially examined for such characteristics as color, odor, and specific gravity. It is routinely tested for acidity, as indicated by its pH reading, and...