The
first time you use a mesh for a melt, it doesn't spall until it
cools. By that time, the glass has hardened enough that any black
specks of metallic oxidisation just land on the top of the melt and
can be brushed away.
But,
once a mesh has been fired previously, it can spall and drop little
bits at any time during the firing process, so some of the bits get
embedded in the glass.
The
only way I have found to prevent this is to sandblast the mesh
between firings to remove any loose flakes of metal. This is time
consuming enough that you may wish to use a new piece of mesh for
each melt. The alternative is to ensure you are using stainless steel
as the grid.
There are several options for grids.
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