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If this is safety glass - two layers of glass with a thick 'plastic' layer in between, then the 'spots' are probably loss of adhesion of the plastic to the glass. This probably need to be replaced or soon the whole 'sandwich' will will separate.

The best way to remedy this is to seal the edges of the cut safety glass with a thick coating of high strength epoxy ... to seal the edges of the polymer used in the sandwich. Your glass cutter may also have other suggestions on how to 'seal' the edges to prevent such 'discoloration', loss of adhesion, etc. BTW... using silicone caulk for sealing such 'safety glass' will accelerate the degradation of the plastic center .... the acidic acid in the silicone caulk eventually reacts with the sandwich polymer.
 
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