I had the same concerns as you when I first started making my own LBB capsules more than 10 years ago.
Here is what I did to make the mixing process easier.
Firstly, since the powders are almost all of slightly different color shades, I built up a batch by mixing part batches of 2 or 3 powders in a small clear glass bowl where you could see how well they were mixed by mixing until the color was even throughout the mixture. The ones of similar color were mixed in separate small batches with other colors until each of the small part batches were uniform in color and then bowls were ...
[retrieve this message]