Handcrafted PotteryHand Made Ceramics For The Home

Is Iron Oxide a colouring agent or Glazing material for Stoneware products?

We make stoneware Salt Glazed pipes and fittings by coal firing method. Since we donot get good colour on bottom rows in our down draft kilns we tried to experiment with using GERU i.e. clay with high iron oxide content. This gave very good results but we are being told it will be considered as glazing and not colouring. We need the clarification whether applying clay with high iron oxide content will be taken as glazing or colouring and whether this clay will be called glaze or colouring agent?

Generally speaking if you mixed the GERU completely with your usual clay, it is coloring. A top coating would be considered as glazing by most (and for terracotta, the color must extend throughout and not just be on the surface).

Most stoneware is made entirely of Geru clay. This is part of the expense of making the items.

small SALT KILN, testing ash and salt glazes. Aurora Pine

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