hi, look at this! for "sepia"

A dry brownish enamel decoration, probably cobalt oxide without the addition of any or with very little flux, making it very susceptible to wear. It occurs on Chinese export porcelain from at least the 1740s up until the 1760's after which it appears to have gone out of fashion. By the end of the Qing dynasty this type of decoratio enjoyed a revival on art porcelain. Very few objects with this type of decoration remains, with its decoration still in good condition.