I am still waiting on the delivery of my G38 and G23, But I am seriously considering using white crayon in the 9mm, Orange in the 45 GAP, and yellow in the 40.
I may just do all white also. I am still trying to decide, but I am going to do something to make them easier to read.
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2x G19, G23, G38
Bull Dog Club: #525
I used colored smiley face stickers on the base plates, a different color for each caliber. Got them at CVS. I also use a silver sharpie to mark and number the side of a magazine: 17-1.....17-20, 19-1.....19-20, 37-1.....37-11, etc..