In Ypres, Belgium there is still a measurable increase of copper in the soil. This was investigated by a Belgian university in 2008 [0]. More anecdotal evidenc

In Ypres, Belgium there is still a measurable increase of copper in the soil. This was investigated by a Belgian university in 2008 [0]. More anecdotal evidence is that you'll often see old ammunition next to freshly plowed fields. [0] https://www.ugent.be/bw/environment/en/research/orbit/ww1/ovam_zware_metalen_ieper_wo1-pdf https://www.ugent.be/bw/environment/en/research/orbit/ww1/ov...