I remember one time, maybe in the beginning days of apug or maybe here, long time ago, someone mentioned not to use one of those industrial mixers for mixing chemistry. Something about oxidation (adding too much o2 into the mixing). Who knows, I'm not a chemist. I did used to mix the big old 5 gal containers of chemicals one time at a lab and I remember using an immersion blender.

Here's a tiny one I got from Ikea. Costs me like $1.99. I use it for my MCT oil in coffee. Now I need to get a few more for chemistry.