The DIN 53147-1993 standard specifies methods for the determination of paper transparency. The standard applies to various types of paper, especially those with transparent or translucent properties. It describes in detail how specific instruments and devices can be used to measure paper transparency, usually by evaluating the ability of rays of light to pass through the paper. The standard also specifies test conditions, methods for preparing samples, and how results are calculated and expressed. The standard provides paper producers and users with standardized transparency measurement methods, ensuring that paper Optical Properties in applications such as printing, Encasement, etc. meet requirements.