What is the difference between the white fluid that comes out exactly at the end of menses and white fluid discharge which a woman has during the period of purity? Do these fluids invalidate ablution?

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The white fluid is a fluid that comes out exactly at the end of menses and this is evidence that the woman became pure; this fluid invalidates ablution.

As regards the white fluid discharges which some women have during the time of their purity, then these fluids are somehow more general, they include the fluid after menses and any other white discharge a woman has, and they also invalidate ablution.