What is this "glitter" effect on my glass? (pictures inside)

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FatSmurf
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What is this "glitter" effect on my glass? (pictures inside)
5 months ago

I bought a used lens that came with this kind of glitter on the glass... but it's inside the glass and cleaning the outside doesn't seem to have any effect.

I'm sure there's a very common name for it but I just don't know what it is.

It doesn't seem to affect picture quality whatsoever but I'm selling the lens and just wanted to make sure I am describing it correctly.

Thanks in advance.

There are two images below, please use the magnification to see the glitter effect.  (Also, apologies for the poor and inconsistent white balance between the two pictures.)

http://imgur.com/UYouSFQ,hz14Sqp#0

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