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Difficulty: Very hardLiteral Comprehension and Fact Retrieval

Read the passage below carefully and answer the question that follows:

Established in 1498, the Kofar Mata indigo dye pits in Kano represent one of West Africa's oldest surviving industrial sites. Craftsmen use natural indigo leaves (Indigofera tinctoria), potassium, ash, and water, fermenting the mixture in deep earthen pits for up to four weeks. Unlike modern synthetic dye processes that rely on chemical fixatives, the ancient Kano technique utilizes pit soil enriched with local clay to maintain a constant alkaline pH during fermentation. While historic records indicate that indigo-dyed cloth was exclusively exported to North African markets via trans-Saharan caravans until the mid-nineteenth century, local royal courts simultaneously consumed substantial quantities for ceremonial attire. Today, despite competition from imported synthetic fabrics, forty-two pit complexes remain operational under the custodianship of hereditary artisan families.

According to the passage, what specific mechanism is used in the traditional Kano dyeing process to maintain a constant alkaline pH during fermentation?

  1. A
    The addition of synthetic chemical fixatives to the natural indigo solution
  2. The use of pit soil enriched with local clayAnswer
  3. C
    The four-week fermentation period inside deep earthen pits
  4. D
    The importation of potassium and ash via trans-Saharan caravans

Answer

The traditional Kano dyeing process maintains a constant alkaline pH level during fermentation by utilizing pit soil enriched with local clay.
The passage explicitly states that 'the ancient Kano technique utilizes pit soil enriched with local clay to maintain a constant alkaline pH during fermentation.' Therefore, using pit soil fortified with local clay is the precise mechanism stated in the text.

Step-by-Step Solution

1
Identify the specific focus of the question.
The question asks strictly for the mechanism responsible for maintaining a constant alkaline pH during fermentation in the Kano dyeing process.
Literal comprehension requires isolating the specific factual query and matching it against explicit statements in the text.
2
Locate the explicit sentence in the text addressing pH maintenance.
The passage explicitly states: '...the ancient Kano technique utilizes pit soil enriched with local clay to maintain a constant alkaline pH during fermentation.'
Direct text evidence corroborates the answer without needing extrapolation or personal assumptions.
3
Evaluate the option choices against the text evidence.
The option describing 'The use of pit soil enriched with local clay' exactly mirrors the factual statement in the passage.
Selecting the choice directly substantiated by passage evidence avoids misreadings and unwarranted inferences.

Key Concept

Literal Comprehension and Fact Retrieval
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Topics

Literal Comprehension and Fact Retrieval

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