We would not take into consideration brown and yellow (fluid) after purification. (Using translation from Abū Dāʾūd 307)
عَنْ أُمِّ عَطِيَّةَ وَكَانَتْ بَايَعَتِ النَّبِيَّ ﷺ قَالَتْ «كُنَّا لَا نَعُدُّ الْكُدْرَةَ وَالصُّفْرَةَ بَعْدَ الطُّهْرِ شَيْئًا»