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dish

  • Object type

  • Museum number

    PDF,A.2

  • Description

    Jun stoneware dish with rounded sides. The dish has a grey body and translucent grey glaze with fine crackle. There are five round spur marks on the base, which is glazed.

  • Culture/period

  • Date

    • 1100-1234
  • Production place

  • Materials

  • Ware

  • Technique

  • Dimensions

    • Height: 67 millimetres
    • Diameter: 266 millimetres
    • Diameter: 139 millimetres (base)
  • Curator's comments

    Published PDF date : Yuan/Ming dynasty 14th centuryRoom 95 label text:

    PDF A2

    Jun ware dish


    Jun wares were made in many kilns throughout Junzhou prefecture (modern Yuxian) in Henan province from the Northern Song (AD 960–1127) until the Ming dynasty (AD1368–1435). Jun wares have relatively coarse stoneware bodies. In the Northern Song and Jin dynasties they appear to have been popular rather than imperial wares. Jun wares are characterised by opalescent blue, purple or even green glazes.


    Stoneware with thick opalescent blue glaze
    Jun ware鈞窯
    Yuxian, Henan province 河南省, 禹縣
    Northern Song or Jin dynasty, about AD 1100–1234

    More 

  • Bibliography

    • Yorke Hardy 1953 p.25, no.A2 bibliographic details
    • Pierson 1999 p.51, no.A2 bibliographic details
  • Conservation

    See treatments 

    Treatment date

    3 April 2009

    Treatment proposal

    Clean. Remove overpaint. Repaint if necessary. Fill chips and paint.

    Condition

    The surfaces have localised areas of yellowing due to aging restoration glaze. This yellow overglaze is likely a urea formaldehyde coating, although no chemical analysis was undertaken.

    The previous restoration utilized shellac as an adhesive and core filler material. It also used a polyvinyl acetate-based calcium carbonate filler material to achieve a smooth surface fill above the shellac. Both restoration materials were not analyzed but their characterisation is based on the opinions of this conservator and others in the ceramic section at the time. This plaster-like surface was then color-matched and painted using an acetone-soluble paint. Finally, an overglaze was sprayed on, extending beyond the immediate locations of the joins or fills for a seamless blend with the actual object surface. This resulted in more than half the dish coated in this overglaze.

    The object exhibited two chips. There is a shallow chip along the rim of the dish and another larger chip opposite to the first with exposed shellac adhesive/filler. The larger chip is the terminus of a semicircular compound join. Three rim sherds have been rejoined here.

    These old joins appear stable based on the percussion method.

    The five spur marks on the underside of the dish fluoresced yellow under UV light indicating the presence of a consolidant, coating or residue.

    Treatment details

    Removal of overglaze and surface cleaning:

    The yellowed overglaze was removed using cotton swabs wetted with industrial methylated spirit (IMS). Acetone also dissolved the discolored overglaze but IMS was preferred as it evaporated more slowly. This revealed filled and overpainted joins and the extent of the chips. Acetone swabs were preferred during surface cleaning of the other areas as it lifted more dirt (blacker swabs).

    The old underpaint was removed using cotton swabs wetted with IMS.

    The larger chip:

    The exposed shellac was carved back to the remaining edge of the dish using #10, 15, and 12 scalpels. The void was then refilled using Fynebond epoxy resin bulked with fumed silica and microballoons for greater opacity and to mimic the speckled fabric of the dish.

    Both chips:

    The surface fills were gradually built up as the lower applications cured. A core fill was created using bulked Fynebond pigmented to match the interior grayish fabric of the dish. The core fill consists of the following Winsor and Newton powder pigments: Terre verte, raw umber, burnt umber and yellow ochre. The surface fills were pigmented to match the object. The surface fills were created using bulked Fynebond pigmented with the following Winsor and Newton powder pigments: Terre verte, cobalt blue, raw umber, yellow ochre, and lamp black.

    The applied Fynebond resin was shaped using a #15 scalpel after a day of partial curing. The final applications of Fynebond were bulked with only fumed silica to create a transparent ceramic-glaze-like finish. After two days of curing of the epoxy resin, the surfaces were polished using several Micromesh abrasive papers from coarse to fine grades (2000, 3200, 4000, 6000, 8000, 12000).

    The remaining PVA/plaster fills were smoothed down using Micromesh abrasive papers, grade 3800, to create a more flush surface.

    Acrylic overpaint:

    The old joins were painted over with thin acrylic paints from the Golden Airbrush Series. The colors used include: shading gray (nearly pure amorphous carbon), titanium white (titanium dioxide – rutile), phthalo green (blue shade) (chlorinated copper phthalocyanine), hansa yellow medium (arylide yellow), and cerulean blue hue (copper phthalocyanine, titanium dioxide – rutile, chlorinated copper phthalocyanine).

    Acrylic paints are not the most sympathetic to a glazed surface and therefore the line of the join is noticeable, even after colormatching. However, acrylic paints are removable.

    About these records 

  • Acquisition name

  • Department

    Asia

  • Registration number

    PDF,A.2

Jun stoneware dish with rounded sides. Grey stoneware body covered in translucent grey glaze with fine crackle. Base and foot glazed, with five round spur marks on the base.

Jun stoneware dish with rounded sides. Grey stoneware body covered in translucent grey glaze with fine crackle. Base and foot glazed, with five round spur marks on the base.

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