How do you cut or break old CD's and keep the rainbow coating intact?

Cece
by Cece
In trying to break and cut the old CD's, the edges of the breaks/cuts lose some of the rainbow coating and the edge looks rough. Do I then put the grout deeper into the piece so it covers the rough edge? How do I do that?????? Or rather, how do I cut a clean edge? That would be more desirable. Thanks!

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