This is fundamentally a part of any kind of race science or racism.
This is also what it means when the antiracists say race is a social construct.
You can’t actually define any of these races rigorously in the first place. It’s a subjective assessment. The racists define race backwards from tribe in order to categorize the people they hate as physically different to justify their hate
Cements and other pozzalanic materials also tend to be very alkaline. Industrial dumping of waste concrete can create a huge environmental hazard.