What is purple dye made of?

Related questions

1. Who divided the Roman Empire for the last time?
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4. Why does Byzantine mean complex?
5. What is Byzantine gold?
6. What does the term Byzantine mean today?
7. Which country is byzantine?
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Tags

1. #extracted
2. #bronze
3. #imperial
4. #royal
5. #tyrian
6. #phoenician
7. #shellfish
8. #first
9. #murex
10. #purple
11. #which
12. #produced