How do I know if a glaze will work with the clay I have?

It's crucial that clay and glazes be matched for firing temperature. Both low- and mid/high-fire clays can bisque at cone 04, but the recommended glaze firing range will be different for each. Glazes need to mature in the recommended glaze firing range for the clay. Fire the glaze too low and it won't mature, too high and it may discolor or flow too much. Fire the clay too low and it won't vitrify enough to be durable, too hot and the clay will soften and distort or may even melt. Also, we always recommend firing test tiles to verify that the glaze is a good "fit" for the clay. Most of the time commercial glazes and clays work together, but it's still possible for them to not have the same rate of expansion and shrinkage, which can result in glaze crazing or shivering.

Can I fire these glazes hotter than the suggested temperature?

Many glazes can fire hotter than the specified firing range, but the glaze will typically flow more, and certain colors may fade or darken. Consult the manufacturer's guidelines to determine whether the glaze you have in mind can take a hotter firing and be prepared to fire test tiles to make sure you know what to expect before applying to actual ware.

What's the difference between Food Safe and Dinnerware Safe?

"Dinnerware safe" means the glazed surface meets food safety standards when it is properly applied and fired. These glazes have a smooth, durable, and crack-free surface and are suitable for food and utensil use. "Food safe" means the glaze does not contain harmful substances (such as lead or cadmium) and has been tested to ensure it doesn't release toxic materials when in contact with food. It does not meet standards for regular food use. If neither of these standards are mentioned, the glaze should be used for decorative applications only.

Can all glazes be used on dinnerware?

No. Only glazes that state "dinnerware safe" are appropriate for regular food and utensil use. Please verify prior to purchasing that the glaze is acceptable for dinnerware if that is your intended use.

What if I want to use a glaze that fires hotter than my clay is intended for?

This is not a good idea. Firing the clay too hot can destabilize or even melt clay that's meant for lower temperatures. Firing the glaze too low will not provide the heat necessary for it to mature to its expected appearance. The clay and glaze should be matched for firing temperature.

I don't find the glaze color I'm looking for. Can I mix glazes to get different colors?

Sometimes you can. Look at the product description for the glaze to see if it notes that colors can be mixed. Otherwise, just know that any mixtures will be experimental; yellow+blue may not give you green for example, and take meticulous notes so you can reproduce any favorable outcome.

My glaze is not the color I expected out of the jar. Should an Aqua glaze really look red in liquid form?

Ceramic glazes can look very different in liquid form compared to the fired result. Don't be alarmed if the liquid color is quite different.

Mid to High-Fire Glazes and Effects

Mid-fire glazes and high-fire glazes are used on pieces made from stoneware and porcelain clay. These glazes allow artists to achieve a range of effects on pieces that are generally more functional and durable than those fired in low-fire env...

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