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Hi Mark - yes thats quite bad staining - how does the image look ?
If you haven't done any optical polishing before you would need to start with something easier like an 8" before polishing the 12" back to a sphere to remove the stains and then refiguring.If you are interested in larger mirror making I would recommend making an 8" from scratch, then repolishing the 12" and going for something larger like a 16" . If the mirror is the old 2" thick Pyrex its really better to replace with something thinner. 2" glass in any size can be quite a challenge cooling wise. 1,5" works much better under 24" .
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