'Around 3500 B.C. people were mixing copper & arsenic to make this: they soon found copper & tin worked better'
bronze
USES FOR ARSENIC: Around 3500 B.C. people were mixing copper & arsenic to make this: they soon found copper & tin worked better
Around 3500 B.C. people were mixing copper & arsenic to make this: they soon found copper & tin worked better
Around 3500 B.C. people were mixing copper & arsenic to make this: they soon found copper & tin worked better
USES FOR ARSENIC
bronze
USES FOR ARSENIC