OHMA - 10 Yen mass loss from standard 4.5g
Channel: Martin Fleischmann Memorial Project
Date: 2019-07-28

A jewellers scale is used to measure the remaining mass of the Ohmasa Gas treated 10 Yen coin

https://en.wikipedia.org/wiki/10_yen_coin

Value  10 Japanese yen
Mass  4.5 g
Diameter 23.5 mm
Thickness 1.5 mm

Composition
95% Cu
3-4% Zn
1-2% Sn