كَمَاءِ الْمَدِّ وَالْمَاءِ الَّذِي يَخْتَلِطُ بِهِ الْأُشْنَانُ وَالصَّابُونُ وَالزَّعْفَرَانُ.
Meaning: Such as floodwater, and water that has mixed with ushnan, soap or saffron.
Ushnan is a plant-derived cleansing agent. Saffron may lightly colour water; soap may alter its appearance.
The allowance applies where the water retains its ordinary identity and fluidity, not where the additive has transformed it.