Can this be done with a red leather purse.. I just picked one up that could use a cleaning.
If it's unlined, I don't see any problems. I actually have a bright red, unlined Quincy from the 90s that had some soapy cleaning. It was in extremely clean condition in most areas, and so did not receive an entire soak. However, there *was* a "grease smudge". I gave the area in question a handwashing using my fingers and a lather of soapy warm water. .... The dye had no problem with the soapy lathering, and the grease smudge came out fine. The lather *may* have picked up a slight hint of pink, but certainly no more dye than would have come out if I'd soaked it fully. And like with the black bag in this thread -- the tiny amount of dye that came out didn't change the color of the leather. ..... (But if you're worried about the dye, a full soak would keep that nice and even too.)
So yeah, my red bag handled that soapy lather spot cleaning fine, and I've never heard of color being a real issue when doing a full soak. So I personally would not see why a red bag would have a problem. I know
bunny has even soaked a green bag (in the link in my first post), and everything came out fine. I don't think "color" is a point of problem as long as the bag is unlined, and the good kind of leather from, say, the early 2000's and before.
If it has a *lining* -- that's when people worry more, particularly about bleeding or color mixing of the dyes, especially if the lining is a different color than the main part of the bag.
(Sorry if that rambled.

)
.