Discussion
Three of the following raise the ash content of flour. Which lowers it?
Effective purification of semolina
Raising the extraction rate
Grinding the bran with the endosperm
Milling wheat without conditioning
Answer: C
Correct answer: Effective purification of semolina
Ash is the mineral residue left when flour is burned, and it is concentrated in the bran and aleurone rather than in the starchy endosperm - so any ash figure is really a measure of bran contamination. A purifier separates light bran flakes from denser semolina of the same size by air current, so good purification removes bran and lowers the ash. The other three all bring more bran into the flour.
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