The alkaline earth metals (abbreviation: RO) are our secondary fluxes and consist of Magnesia (MgO), Calcia (CaO), Strontia (SrO), Baria (BaO) and Zinc (ZnO).

Magnesium, Calcium, Srontium and Barium are found in the second column of the periodic table of elements.

Zinc is the anomaly.  It is found in the 12th column of the periodic table but behaves the same chemically, in a glaze, as the other alkaline earths.

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