Table 1 Questionnaire for the collectors

1 How many indigo yielding plant species do you use?

2 What are their local names?

3 What do their local names mean?

4 From where do you collect indigo yielding plant species?

5 Is there a lot of resources for indigo yielding plant species?

6 Which species is the best material and why?

7 During which months do you collect these indigo yielding species?

8 How do you extract indigo from these indigo yielding species?

9 How many lime powder do you use for extraction of indigo?

10 How often do you extract indigo per year?

11 How do you distinguish the quality of indigo paste?

12 Can these plants in flowering period produce high quality?

13 Has the plant species changed over the past couple of years?

14 Why are you using these species for indigo extraction now?