Just a note on weighing hard soaps, if you’re lathering on the puck you’ll need to let it dry before doing the ‘after’ weight, the residual water makes a considerable difference - sometimes the soap weighs more right after shaving than before. I always weighed right before I shaved every day when I test soap usage.
Take at least a weeks worth of measurements using the same brush, throw out the high and low measurements and average the rest. More is better.
Only a soap geek would do this, lol.
Yeah, some of us have too much time on our hands!