If blood’s material substance has been washed away but a difficult-to-remove pale stain remains, this residual effect is not treated identically to an existing mass of impurity.
If impure particles remain, simply reducing the colour does not establish removal.
فَطَهَارَتُهَا زَوَالُ عَيْنِهَا
Translation: Its purification is the removal of its substance.
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Types of Impurity and Methods of Purification
If blood’s material substance has been washed away but a difficult-to-remove pale stain remains, this residual effect is not treated identically to an existing mass of impurity.
If impure particles remain, simply reducing the colour does not establish removal.
فَطَهَارَتُهَا زَوَالُ عَيْنِهَا
Translation: Its purification is the removal of its substance.