|Discovering Asia's ceramic development|
The picture on the left shows how early Sukhothai and Sisatchanalai underglaze wares from the Turiang shipwreck would have been stacked in the kiln, separated by spur discs and on a single tubular support. At this time, both places used the same stacking method.
The picture on the right shows how Sisatchanalai eventually stacked celadon, on individual tubular supports. The Sukhothai kilns continued to use spur discs throughout their production period, despite the scars caused.
The third picture shows the different clays used in Sukhothai and Sisatchanalai over time. (Click the image to see close-up detail.) The middle sample with its white quartz particles was used at Sukhothai throughout its production period.
The lower sample shows the secondary clay used in early Sisatchanalai ware. As with the gritty Sukhothai clay, this was rough, and needed to be covered with a layer of 'slip' (smoother liquid clay) before painting. The added layer can be seen in the cuts below the glaze.
The top sample shows the finer grey clay used for later Sisatchanalai celadon. Decoration could be incised directly in this semi-hard clay. (Incised decorations are fine lines carved in the clay. Deeper glaze in the cuts appears darker green, adding soft contrast to the motif.)