Discussion
Consider the following statements about brightener dosage.
1. Whiteness rises with dose only up to a maximum.
2. Beyond that point the fabric takes on a green or blue cast.
3. More brightener always gives a whiter result.
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 describe the dose response correctly: whiteness rises to a maximum and then declines. Statement 3 denies that maximum. Beyond the optimum the added blue overshoots the yellow it was cancelling and the goods take a green or blue cast - a fault called greening, which no amount of further brightener will correct because more of it is the cause.
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