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Table 1 Questionnaire for the interviewees.

From: Quality blues: traditional knowledge used for natural indigo identification in southern China

1 How many indigo-yielding plant species do you use?

2 What are the local names of these indigo-yielding plants?

3 What do these local names mean?

4 How to make indigo paste after harvesting indigo-yielding plants?

5 How many ways can you judge the quality of indigo paste?

6 How to judge specifically?

7 Which of these methods do you like best?