Among Trubner's many accessions are a Yuan dynasty Dish with Phoenix and Flower Motifs (c 1300), classic Jingdezhen porcelain with dense cobalt underglaze decoration
. Trubner 'S widow, Ruth, gave a Qing Dish with Design of Camellia and Flowering Plum (c 1730) in memory of her late husband and was assisted with money from the Gates Acquisition Fund (Mimi Gardner Gates, SAM director emerita and current SAAM director, is a stepmother to the Microsoft co-founder Bill Gates).
Obtained copper (II) chloride is used as a colorant of underglaze decoration.
Nowadays, copper (II) oxide and copper carbonate compounds are usually used for underglaze decoration. Both of them have some difficulties for glaze applications.
TOBY jugs fall into three groups: Jugs with drab Whieldon-type coloured glazes in a limited palette, which are the most sought-after; jugs with underglaze decoration
in the Prattware colours of creamware and pearlware; and jugs with enamels applied over a clear glaze (including jugs by Ralph and Enoch Wood).
A founder of the Women's Pottery Club in Cincinnati, Mary Louise McLaughlin, moved to the new pottery in 1879 which took the Longworth's family home of Rookwood, and developed a new style of underglaze decoration
by adapting Chaplet's Barbotine technique from France, using coloured slips.
The pigments obtained are used as in-glaze colourants in stoneware glazes and as underglaze decoration components on white earthenware bodies.
Besides using STD-P1, P1FA, STD-P4 and P4FA coded pigments in stoneware glazes, they were also used for underglaze decoration. In this respect, Kutahya Tiles were decorated by using each pigment.
The handbuilt teapot-centered tableaux of the 1980s are much tighter, with impeccably controlled geometric designs, the result of carefully taped zones of underglaze decoration
that echo the angularity of their forms.