MAN Made Gold Intel (also make fake gold coins from copper)

 

https://edu.rsc.org/experiments/turning-copper-coins-into-silver-and-gold/839.article

https://chemistry.stackexchange.com/questions/15541/turn-lead-into-gold-via-radioactive-decay

https://www.ucl.ac.uk/museums-static/objectretrieval/node/329

https://patents.google.com/patent/US20080245187A1/en