Qing Dynasty porcelain is dated by reign marks painted in underglaze blue on the base (six-character format: "Da Qing [Emperor] Nian Zhi"). However, marks were frequently copied in later periods — period-correct reign marks must be corroborated by technical analysis (thermoluminescence dating) for valuable pieces.
Get your own AI-powered appraisal report with value estimate, market analysis, and comparable auction sales - free.