When making a metallic texture, I *always* use ambient 0:
pigment {rgb <.95,.975,1>}
finish {ambient 0 diffuse .7 brilliance 10 reflection .2 reflect_metallic
specular 1 roughness .01 metallic}
But I don't think it would make a good metal for R2D2's head.  This might be
better:
finish {ambient 0 diffuse .8 brilliance 3 reflection .05 reflect_metallic
specular 1 roughness .01 metallic}

(I haven't tested them)

ZK
http://www.povplace.be.tf

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