Useful reading ....

[WM6]

Useful reading for those interested in alternative approaches to Gold sensing:

https://www.researchgate.net/profile/Nicolas_Goubet/publication/44689701_Crystallinity_Dependence_of_the_Plasmon_R esonant_Raman_Scattering_by_Anisotropic_Gold_Nanoc rystals/links/00463517677c505102000000.pdf

[reza vir]

There are many ways, but all are inefficient :frown:

[WM6]

There are many ways, but all are inefficient :frown:

Yes, if you intend to sense something at kilometers.
For those satisfied with cm or even meters, classical metal detecting have long been available.

[Geo]

Translator don't give good result so let stay at classics lrls :lol: