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terracotta planters what cone?

updated sun 1 nov 98

 

tmartens on sat 31 oct 98

A nursery wants me to supply large terracotta planters, unglazes.
What cone would be the best to fire to, to keep the porosity?
I usually bisque at ^06, would ^02 be too high? Could I get away with
a lower temp?
Toni Martens,Durban, South Africa.