«يجوز الوضوء بماء الزعفران وبكل ماء خالطه شيء طاهر فغير أحد أوصافه»
Ablution may be performed with saffron-colored water or water whose characteristics were altered by a pure additive.
The Hanafi reasoning turns on whether the liquid remains water despite such an alteration. A change of color or smell does not necessarily end the designation. One must consider the additive and whether the resulting substance retains the identity of water. This must not be extended uncritically to water rendered impure by contamination, which is a separate question.