Stoneware bowl with straight sides. The bowl has a buff body and cream slip, dulled and crackled through burial. The foot-ring is unglazed.
- Made in: China
- Height: 85 millimetres
- Diameter: 130 millimetres
Published PDF date : SongRoom 95 label text:
Bowl with crackled glaze
The exact kiln site where this was made, and the age of this bowl, remains under discussion. It has straight sides and stands on a high foot. It is covered with a crackled glaze.
Stoneware, with crackled glaze
Qing dynasty, AD 1644–1911
11 March 2009
Reason for treatment
Examine additional layer on rim.
The object has a whitish buff coloured fabric with transparent white glaze. This glaze has crizzled on the interior and exterior surfaces. While crizzling can be seen unaided on the walls of the vessel, the very fine crizzling on the bottom of the interior can only be detected with the aid of a microscope.Dark brown lines can be seen on the vessel underneath the glaze. These lines correspond to the length of the crizzling and are the result of staining from the depositional environment, which would have included adjacent ferrous objects or an iron-rich soil.There is a manufacturing flaw on the underside of the object where a lifted chip is covered in glaze.The rim and ring base are unglazed. Grinding or filing marks are visible on the unglazed base via stereomicroscopy. The marks appear in a chevron-like pattern with the narrower ends pointing in a counter-clockwise direction. The rim bears mortar-like concretions. This unidentified material was applied after the bowl was glazed and fired as the glaze can be found to continue underneath it. This material is compact but soft and powdery (e.g. when scratched with a scalpel). The longest band of this substance offers a bit of give when gently prodded with a skewer during microscopic inspection. Yet, this material is not loose. The unglazed rim and the mortar-like concretions also bear iron staining. Initial thoughts regarding this material was that it was corrosion products from a metal rim. However, x-radiography and visual inspection have led away from this line of thinking. Instead, it is more likely to also be the result of the depositional environment as by their soft, porous, and unglazed nature would have promoted staining. The unidentified material was not sampled nor subject to instrumental or chemical analysis at this time. The cause or meaning behind its presence cannot not yet be elucidated.
Visual examination was undertaken using a stereomicroscope. X-radiography was also employed. Three x-radiographs were made (6950, 6951, 6953). The last radiograph 6953 produced the best exposure but was a bit blurry (80kV, 3 minutes).Dry surface cleaning was also undertaken to prepare the object for permanent display. This consisted of gently wiping with smoke sponge. Wet cleaning was avoided due to the fine crizzling and to prevent any introduction of moisture beneath the glaze.
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Object reference number: RRC39235
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