Copper
A reddish metal with atomic number 29 and the symbol Cu. Its electrical and thermal conductivity is second only to silver, making it standard for wiring and plumbing; alloyed with tin it forms bronze.
Deep blue is one of the hardest colors in Fireworks. Blue usually comes from Copper compounds, but if the flame gets too hot, the copper-chloride emitters break down and the blue washes out. Pyrotechnicians must make an explosion burn “not too hot.”
0
The Statue of Liberty wasn't always green — it began shiny brown. Its skin is copper, so in 1886 it gleamed a coppery hue. Sea air, salt and pollution oxidized it into a blue-green patina, complete by about 1920. The patina isn't damage; it shields the metal.
0
The Octopus's blood is blue, not red. Human blood is red because the iron-based protein Hemoglobin carries its oxygen; in octopuses that job falls to Hemocyanin, a Copper-based protein. Hemocyanin turns blue when it binds oxygen, and carries it better in the cold, low-oxygen sea.
0