Jonathan Cross works
Are you firing on a bed of course sawdust? Very cool.
They are rice hulls which are pure silica. Fast growing trees, grasses, and rice hulls are extremely high in silica and act as a high temp barrier between the work and the shelf. Silica is a glass and can be fluxed when combined with sodium sources such as wood ash, salt, etc. Sawdust would burn away and expose the work to contact with melters on the shelf surface.
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