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Cobalt Oxide


The most powerful colouring oxide. This produces a deep blue or blue- black colour in lead and leadless glazes and a vivid blue in alkaline glazes.

It gives good colour variations when used in combination with other oxides. 1 - 1.5% for a deep blue.

To remove oxide mistakes or for making a design, use a pencil eraser. It won't smear like when trying to wash the oxide off.

TOXIC. Please read the safety information prior to purchase and use:

Safety Data Sheet (pdf)