I’ve been thinking about this a lot lately, with current projects, and thought I’d throw it out there. I find that when I’m working with an ink color that is made up primarily of transparent white (and I use all oil based inks), it’s better to print your darker color first and then overprint with the mostly transparent ink. I ran a test a number of years ago where I printed the transparent color first and then overprinted with dark text and vice versa. When you overprint with the darker color, it often pools on top of the transparent ink color and just doesn’t look as nice. I find that printing the transparent color last really doesn’t make such a difference as if you had done it first, but then any little discrepancies are welcomed when printing letterpress. Just thought I’d throw that out there in case anyone likes to print with transparent colors as much as I do! My apologies if everyone already knows this.