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What is Balanced stone is dental stone: and explain in detail?
A stone with a setting time established by the addition of proper quantities of both accelerator and retarder is called ‘balanced stone’. 
Typical accelerators are potassium sulfate and potassium sodium tartrate (Rochelle Salts).
Typical retarders are sodium citrate and sodium tetraborate decahydrate (Borax).
Manappalil pg-313