Pin Marks

Pin marks occur during the manufacturing process. After glazing, plates are fired to ensure an even and complete glaze coverage. Plates are placed into "cranks", supported under their rim on three small refractory pins.

After firing, a small amount of the refractory may remain in the fired glaze layer, this residue is removed by grinding to leave a smooth finish. Occasionally, the grinding process may result in a small area of the underlying body becoming exposed. This is not detrimental to the performance of the product since the biscuit fired body is fully vitrified. Vitrified products are defined as having zero porosity and, as such, will not stain or become unhygienic when in use.

A fully glazed plate back helps to ensure a long, trouble-free use of the product.


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