Is the "white story" a white discharge, and what is the ruling on seeing yellowish discharge after ghusl on the seventh day of menstruation?

A woman ceases to menstruate by one of two signs: dryness, which is the cotton swab emerging clean without any trace of blood, yellowish discharge (ṣufrah), or brownish discharge (kudrah); or by the white discharge (al-qaṣṣah al-bayḍāʾ), which is a thin white fluid that appears after menstruation. If yellowish or brownish discharge appears after seeing the white discharge, it is not considered menstruation unless it occurs during the usual period of her menses. Ghusl (ritual bath) must be performed immediately upon seeing one of the signs of purity.