Figure 5
Two details of the decoration pattern, with corresponding radiograph and negative emissiograph. Yellow arrows: areas presenting a strong opacity in the radiograph and a strong electron emission and corresponding to the visible pattern; Red arrows: areas presenting a strong opacity in radiograph and a strong electron emission and corresponding to a visible black pattern; blue arrows: areas presenting an absorption of X-rays but do not emit electrons and corresponding to a visible black pattern; green arrows: corresponding to visible black lines invisible in the radiographs and in the emissiograph.