Glaze test

Glaze

Glaze is a layer of glass which is fused into place on a pottery body. The glaze provides a hygienic and increase strength to the pottery and it is non-porous. It is also decorative, providing colour, shine and textural contrast with the body.

Glazes are made up by adding ingredients in water, which gives suspension to the ingredients, then passing through sieve to break up lumps to get a smooth mixture. Glazes can be dipped, sprayed  or brushed onto vessels. Upon the water is absorbed by the porous pottery or dried, a layer of powder will attach to the pottery body. During the firing they all fuse together to form a compact layer of material.

Low Firing Glaze 1060℃

All tiles were dipped two times, the first dip was up to the second indent from the bottom and the second dip was just above the first indent. It is the first time to use a kiln. Follow the instruction from Matt we started the regulator with 10% (1) for one hour , 30% (1.5) – one hour, 50% (2.5) – one hour and 70% (just less than 4) – one hour then up to 100%. In this stage it is needed to keep checking the cone (small cone 4), which indicates the temperature inside the kiln, through the spy hole. Once the cone has bent, the kiln will be turned off. It was took about one hour and 10 mins to bend.

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even, semi opaque, soft white glaze

First column start from the top terra cotta, st. thomas and porcelain. The result was satisfied and it is look good on these three clay bodies.

matt black glaze

third column – terra cotta, st thomas and ash white. Different clay body produces different effect to the glaze. In this test, only the terra cotta have a rich black color.

opaque, smooth bright green glaze

second column  – ash white, st thomas and porcelain. The glaze was crawling. It is believed that the glaze was too thick or the firing temperature was not high enough.  With the suggestion from Duncan will try again at 1180℃ and thinner the glaze.

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Second try of the green glaze. This time the consistency is correct. The only problem was the vessel wasn’t dry enough when I glazed it. It causes the glaze chip off from the vessel.

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Dry Glaze Test 1280℃ – follow the tri-axial blending method.

I always interested in dry glaze or texture glaze. This dry glaze surface blend in with other colors and it produces a very  interesting effect. It seems like a rusty surface of different kinds of metal.

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Shin surface wood ash turquoise glaze 1280℃

Wood ashes are not only used as fluxes but also introduced colour in glazes and produce interesting flecking. Those light-brown spots on the surface are melted wood ash.

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