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The student wants to contrast the mechanisms that make Maya blue and Han purple unusually durable. Which choice most ef…

While researching ancient pigments, a student took the following notes:

• Maya blue is an ancient Mesoamerican pigment created by embedding organic indigo dye within palygorskite, a fibrous clay mineral.

• Encapsulating the indigo dye inside the clay's microscopic channels shields Maya blue from chemical solvents and biological decay.

• Han purple is an ancient Chinese pigment made of barium copper silicate, a synthetic inorganic compound.

• The rigid, tightly bonded crystal lattice of barium copper silicate prevents Han purple from fading under thermal and chemical stress.

• Both pigments have retained their vibrant coloration across millennia on archaeological artifacts.

The student wants to contrast the mechanisms that make Maya blue and Han purple unusually durable. Which choice most effectively uses relevant information from the notes to accomplish this goal?

Answer & explanation

Correct answer: A. While Maya blue derives its resilience from encapsulating dye within fibrous clay channels, Han purple resists degradation through its tightly bonded crystal lattice.

Choice A is the correct answer because it directly accomplishes the student's stated goal: contrasting the specific physical mechanisms responsible for each pigment's durability. It identifies that Maya blue's resilience stems from trapping dye molecules within the channels of fibrous clay, whereas Han purple's durability arises from the rigid stability of its inorganic crystal lattice.

Choice B is incorrect because it emphasizes a similarity in the pigments' longevity and stress resistance rather than contrasting their durability mechanisms.

Choice C is incorrect because it focuses solely on the durability mechanism of Han purple, neglecting to contrast it with Maya blue.

Choice D is incorrect because it contrasts the geographic origins and general ingredients of the pigments rather than the structural mechanisms that produce their durability.

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The student wants to contrast the mechanisms that make Maya blue and Han purple unusually durable. Which choice most ef…

The student wants to contrast the mechanisms that make Maya blue and Han purple unusually durable. Which choice most effectively uses relevant information from the notes to accomplish this goal?

Answer & explanation

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