What does semen look like on underwear?

The form of madhy (pre-seminal fluid) on clothes cannot be precisely determined, as it varies with the color of the fabric. What is important is to ascertain the characteristics of madhy, which have been mentioned in previous fatwas. If there is doubt about a discharge, whether it is maniy (seminal fluid) or madhy, and neither is clearly preponderant, some scholars obligate ghusl (ritual bath) and wudu (ablution), along with purifying whatever it has touched. Others give the individual the choice to consider it either maniy or madhy.