As the title says, it isn't possible to identify the rare particle traces based on their icons alone. Could we have them a little different from one another? Perhaps just have letters or numbers in the bottom right corner signifying different traces if making new icons isn't worth the time.
Agreed. I keep them in alphabetized piles too, and gotten used to it pretty well, but this would be helpful. Whether it's unique symbols, different background colors or just some tiny letters in the lower left corner.