just float in mercury or lead :)

Have you ever seen numbers run on float tested dice that test as biased?

Metal dice are less likely to have balance issues on the individual dice as long as the mold is balanced (because they are solid and heavy).

Source - I own a dice company.

I have not, but that sounds like a great kinda thing that a dice company should post! My d&d players are _kinda_ dice obsessed. What is your company? My buddy and I run a small business making dice towers/trays on a laser.

Yea, it's something that we want to do at scale (rollers, dice) via machine vision so all the "well actually" people that pop out of the woodwork with edge cases can be addressed ahead of time.

Hahaha, not ready to dox myself yet but you can probably figure it out with a little digging.

A fluidised bed setup? (Would generate some pretty bad dust, but it might beat mercury vapors)