Use between 4–10% red iron oxide. Test various amounts of red iron oxide added to slip before applying to your ware. If a specific viscosity or thickness is desired, add a flocculant such as vinegar or Epsom salts. Add a deflocculant, such as Darvan 811, to increase fluidity.
This recipe was shared by Robin Hopper in the November/December 2019 issue of Pottery Making Illustrated.
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