After discussion with AO moment ago, we never found this type of residual in 167GZ. It looks like pebble. (เม็ดสาคู)
By normal, we used to find only 3 types of residual in this grade as below.
1) Plastification
2) Hard & big particle
3) Contamination
retain on sieve
So, could you please take the product near problematic lot for screening?