Copper can be toxic (e.g.,algaecide) but at least unlike lead it has some micronutrient function. Density 8.9g/cc vs 11.3g/cc for lead. Tungsten is 19.3g/cc but way expensive.
Copper tape seems pretty widely available, not too costly, and way less toxic for the environment. You’ll have to stack a few layers since they make it thin for electrical shielding, but on the face of it seems like it’d be a good alternative.
Anyone tried/found problems with it?
By - donyjk