+13 votes
379 views
in Technology by (4.7k points)

hint: think of two colors make blue




4 Answers

+1 vote
by (448k points)
copper and titanium
0 votes
by (37.7k points)
black magic?

I dont know.
+1 vote
by
copper and ....
+1 vote
by (45.5k points)
One of them is copper, right?
by (4.7k points)
i don't know?



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