Why did Spiderman turn black?

Related questions

1. Does Peter Parker marry Mary Jane?
2. Does Gwen Stacy die?
3. How does Gwen Stacy die in Amazing Spider Man 2?
4. How did Spider Woman get her powers?
5. Did Peter Parker have a son?
6. Does Peter Parker end up with Mary Jane?
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8. How did Gwen die?
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Tags

1. #strength
2. #itself
3. #teeth
4. #personality
5. #tongue
6. #symbiote
7. #peter
8. #granting
9. #spider
10. #turning
11. #downside
12. #piranha
13. #while
14. #upgrade
15. #altering
16. #black
17. #speed