Question Concerning Different Colored Strops: Latigo, Bridle...

[Brontosaurus]

Sometimes strops are pasted with red and black Solingen crayons for sharpening purposes, an assumption on my part here being that this is charging the strops with red and black ferric oxide pigment, also used for the same purpose in some circles.

Following this, I am wondering about the impact that, say, a red or black Latigo strop might have over a "natural" treated strop relative to the dye or pigments being employed. Would the red or black strop be inherently more aggressive? And beyond this, what about the sharpening impact of various shoe polish preparations for treating old worn strops?

[Edit: if a Mod could correct the typo in the title, I would appreciate it.]