I used a texture that animates fairly well. To get better results you will
need to modify the period and range of effect. You can see where I, too,
remarked out the reflection_blur. I attempted to animate your function, too,
but hit some weird noise in my first few attempts. Stil working on that.

Enjoy!

Grim
------------------------------------------------

   texture {
      pigment { color rgb <0,0,.001> }
      finish { diffuse .05 ambient 0 //reflection_blur .06
         reflection_max .35*<.62,.63,.67> reflection_min .35*<.41,.465,.485>
reflection_falloff .9
         reflection_exponent 1.7 specular 5 roughness 100 brilliance 3
metallic 1 }
      normal { wrinkles normal_map {
         [0 waves .05 scale <2500,1500,2500> translate -.5 rotate -45
frequency 25000 phase (sin(2*pi*clock)) ]
         [1 ripples .05 scale <2500,1500,2500> translate .5 rotate 45
frequency 25000 phase (cos(2*pi*clock)) ] }
         scale <.001,1,.001> scale <.02,50,.02>
         warp { turbulence .6 octaves 2 lambda 5 omega .2 }
         warp { turbulence -.6 octaves 2 lambda 5 omega .2 }
         turbulence .6 phase (sin(2*pi*clock)) scale 1000 }
translate -15*z }
         interior { ior 1.45 } hollow translate <0,-.5,5> }

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