Seashells are largely

#11602
Stephen Richard
Participant

Seashells are largely calcium.  This will stick to the glass if a separator is not used.  The durability of the shells depends on the thickness, as some of the calcium seems to “disapear” on each firing.

Stephen Richard

blogs at: http://www.verrier-glass.blogspot.com/   and  http://www.glasstips.blogspot.com/

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