Len Castle Rare Square Slab Vase with Crackled Glaze

Len Castle, rare square slab vase, of slight tapering form,…
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Len Castle, rare square slab vase, of slight tapering form, with heavily crackled glaze and textured surface, with natural patina and flaking, blue unglazed interior (firing crack), impressed potter's mark above the foot, 26 cm x11 cm x11 cm

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  • Crackles / Cracquelure - In ceramics, crackles may be introduced intentionally during the firing process, as was often the case with Oriental ceramics, and are known as artificial crackles. Natural crackles occur with age, and if the glaze is transparent, may be difficult to detect. Natural crackles may not cover the whole surface of the object and may be uneven in size.
  • Patination / Patina - In broad terms, patination refers to the exterior surface appearance of the timber, the effect of fading caused by exposure to sunlight and air over the course of a century or more, changing the piece to a soft, mellow colour.

    As patina is very difficult to replicate, it is one of the most important guides to determining the age of furniture.

    Patina is also the term applied to the bloom or film found on old bronzes due to oxidisation.
  • Firing Crack - A firing crack is a crack in a porcelain or stoneware item that occurs whilst the item is in the kiln.They are usually caused by faulty design, where one part is thicker than the surrounding area, and being thicker it cools more slowly, setting up a stress with the surrounding area. Firing cracks are not often seen on modern mass produced porcelain, as the damaged items are discarded during prooduction. However they are seen in earlier items and artisan-produced objects.

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