| 摘要 |
<p>1. Method of marking panes by deposition on a surface of the pane of a composition such as an ink, characterized in that the marking is carried out by means of a composition which leaves a deposition which is practically invisible in normal light but which may be rendered temporarily visible by fluorescence so as to identify the mark by subjecting the pane to ionising radiation by means of a source emitting such radiation under suitable conditions of ambient illumination.</p> |
