Glaze Questions - Potclays Ltd.

How should I safely handle powdered ceramic materials?

Dust from powdered ceramic raw materials, glazes, slips and clay can cause health problems if not properly controlled. The Health and Saf… Read More About This Question

Why is my bright gold lustre dull?

This is most obvious with the bright gold but can happen with any lustre. The surface is matt and sometimes discoloured.The problem is one of … Read More About This Question

Which of your glazes are vegan-friendly?

This is a question we are asked increasingly often. We have approached our glaze suppliers and detailed their responses below. As far as Potcl… Read More About This Question

Why hasn't my special-effect/reactive glaze fired as expected?

Artistic/special effect glazes usually require a generous application to achieve the desired effect. Varying the heatwork will produce differe… Read More About This Question

What should the specific gravity be for my dipping glaze?

Very generally speaking, ideal specific gravity for most dipping glazes is between 1.4 and 1.6. However there are a lot of variables which&nbs… Read More About This Question

Why does my tin white glaze have a pink tinge?

This fault is caused by volatilisation during the firing and may produce a variety of other undesirable effects.In the case of the example, th… Read More About This Question

What’s causing the rough, pitted surface on my decal transfer/on-glaze enamel/lustre decoration?

The glaze surface appears to have a layer of sugar stuck to it. In actual fact it is a mass of tiny bubbles. In industry this fault is known a… Read More About This Question

What’s causing my glaze to blister?

Blisters in the surface of the glaze are the remnants of bubbles which have burst but not completely healed during the firing. The reason for … Read More About This Question

What’s causing my fired glaze to be full of bubbles?

Bubbling in glazes can occur for a variety of reasons. It may be the result of some impurity (contamination) in the glaze burning away. For ex… Read More About This Question

What's the recommended firing process for clay and glazes?

We generally recommend biscuit firing at 1000-1060C then following with a glaze firing to a higher temperature which matures both the clay and… Read More About This Question

What is the optimum firing rate to use?

The optimum rate depends upon the thickness of the pots and clay type e.g. thin cast and grogged bodies can be fired quicker than thrown and u… Read More About This Question

How can I resolve crazing?

Crazing takes the form of fine cracks spread throughout the glaze. Craze lines may be so fine that they're difficult to detect with the naked … Read More About This Question

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