This is just one example of how the use of graphics can aid in doing research, in this case showing two supposedly rare Yuan dynasty blue and white stem cups with carved decoration as instead coming from the same mold. As mentioned earlier, the press-mold technique was used during that time, but it seems odd one dealer would have two such pieces from the same mold and not be willing to stand by them passing the TL test. What I really question the most though, is the different shades of cobalt between the interior and the exterior decoration on stem cup number 2.

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