When using opaque glazes, there is no easy way to prevent decoration in other colours from running. This could be exploited to decorative effect: here, the fuzzy contours of the inscription, which appears to read 'abduhu ('His [God's] servant'), give the impression that it has been written with a brush rather than a pen, while the green patches at the rim drip down in a deliberately haphazard manner, which also imitates the drip-and-splash decoration of Tang stonewares.