All forms of ceramics can

[Anonymous]

All forms of ceramics can work – unglazed is best.  If glazed, sandblast to roughen the surface and kilnwash.  Deeper shapes may require drilling air-escape holes.

Stainless steel (also kilnwashed) is good for draping over – not into unless very shallow.

Avoid rocks which can have water trapped inside which, when heated, will expand and cause the rocks to explode.

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Paul
FusedGlass.Org
Helios Kiln Glass Studio
PaulTarlow.com