Monthly Tech-Tip | No tracking! No ads! |
This recipe melts to such a fluid glass because of its high sodium and lithium content coupled with low silica levels. Reactive glazes like this produce interesting visuals but these come at the obvious cost of being runny like this. But this problem can be managed with glaze technique, a catch glaze on the outside and a liner glaze (to prevent the formation of a lake on the inside bottom (which leads to glaze compression problems). A bigger problem is that recipes like this often calculate to an extremely high thermal expansion. That means food surfaces will craze badly. Another issue that underscores the value of using a liner glaze: Low silica often contributes to leaching of the lithium and any heavy metals present in colorants.
Glossary |
Leaching
Ceramic glazes can leach heavy metals into food and drink. This subject is not complex, there are many things anyone can do to deal with this issue |
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Glossary |
Glaze Compression
In ceramics, glazes are under compression when they have a lower thermal expansion than the body. A little compression strengthens ware, too much can weaken and even fracture it. |
Glossary |
Fluid Melt Glazes
Fluid melt glazes and over-melting, over fired, to the point that they run down off ware. This feature enables the development of super-floss and cyrstallization. |
Glossary |
Melt Fluidity
Ceramic glazes melt and flow according to their chemistry, particle size and mineralogy. Observing and measuring the nature and amount of flow is important in understanding them. |
Troubles |
Runny Ceramic Glazes
Glazes of high melt fluidity are likely to run if applied to thickly or have not catcher glaze |
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