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How to make a CD-like specular in a material?

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    How to make a CD-like specular in a material?

    Hey, so I would like to make specular in my material which is reminiscent of a CD. What I mean by that is Id like the specular to have a rainbow-like effect which splays out from the specular highlight. I don't want the specular highlights to be lines going toward the center like they do on a CD, I merely want the effect of different colored rings coming out from the circular specular highlight on an object.

    My guess at how to do this is to use the light vector and apply a gradient texture sample to it but Ive messed around with this and am not sure how I would apply this correctly. Does anyone know how I might create this effect?
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