An alundum stone is an abrasive that will remove unwanted enamel from your design. You must work wet when using an alundum stone as the water helps remove the aluminum oxide residue created during the process and prevents you from inadvertently grinding the oxide into your glass surface.
While working with a bowl of water or with running water, stone the edges of the blank with the 220 grit alundum stone.
If you find the enamel is not coming off, switch to the 150 grit then repeat with the 220 grit to finish.
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