But is that drop in trust really from one program? Seems like there could be other local reasons for it. Hard to pin all of that on a single spy trick.

Man, our training guy brought in a burnt pizza to show us what a bad cure looks like.

Yeah, that acid test is the only thing that really works for me with calcite versus quartz in the field. I started carrying a small dropper bottle of vinegar as a quick check before I even pull out the good acid. Saves a ton of time and you don't waste your main supply. Marking the vein with a different color tape in my notes helped too, just a visual cue so I stop second-guessing myself later.

What's the best scar you've got from that method, @shane838?

Maybe stellahayes got a magic machine that actually works. Mine just turned into a very expensive paperweight that spits mud. Those things have more settings than my TV, and half the time it's just quicker to do it by hand. You're not missing anything, some tools just create more problems than they solve.