It even yields relatively clear images of engraved inscriptions that have gone fuzzy from corrosion. Yang mentions a piece of porcelain that appeared flawless on the surface, while an X-ray photo revealed a dark patch (the brightness of X-ray images varies depending on the material) in the upper half, a sign that the piece had undergone a major repair in the past.
楊源泉舉例，像是一只表面完好無缺的瓷瓶，被 X 光一照，才發現它的上半部呈現出大塊陰影，表示曾經「大修」過（不同材質，X 光照射出的亮度就不同），看來原先修復者的功力不錯，可以以假亂真。