We would not take into consideration brown and yellow (fluid) after purification. (Using translation from Abū Dāʾūd 307)
عَنْ أُمِّ عَطِيَّةَ وَكَانَتْ قَدْ بَايَعَتِ النَّبِيَّ ﷺ أَنَّهَا قَالَتْ «كُنَّا لَا نَعْتَدُّ بِالْكُدْرَةِ وَالصُّفْرَةِ بَعْدَ الْغُسْلِ شَيْئًا»