(Mercury) Atlas Rocket question

Gary Slater
 

Since we aren't flying today, I am doing other rocket related things today. 


I really feel like I should know this already.  But I don't and I cannot find an answer.

If you know, say so.  I would like to see who knows the answer to my question.

But let's be honest, if you don't know, I would appreciate your honesty in stating so as well.  I hope not to be only one who doesn't know.  


The question:  

What was the skin on the Atlas rockets made of that made them so shiny?  


Thank you, gary.


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