Using Strontium Isotope Analysis to prove Black people inhabited ancient Britain

The amount of 87Sr varies in rocks depending on the age. J. E. Ericson was the first to establish the link between the 87Sr/86Sr ratio in bones and teeth being directly related to the levels found in the geographical area a person grew up in. The composition of the enamel does not change after childhood. Analysis of the Strontium ratios can help determine human migration and mobility. The levels of Sr from a particular region can be compared to the Sr levels in ancient human bones. Different Sr levels in the enamel compared to the bone can indicate evidence of migration during childhood. [The Black Celts - African Substratum Theory (2021), by Ibrahim Ali, chapter on Strontium Isotope Analysis.]