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Definitely 18 months ago I showed a bunch of pics of the mid tan Cheaney shoes I applied oxblood to, to give a nicer deeper colour. If you use acetone or alcohol you will have much more luck in breaking off the old colour and getting depth to whatever polishes you add on top.
I think it will be incredibly subtle, and hardly noticeable if you try to get a depth of shades on a dark brown shoe without doing this. If you are lucky, under one particular lighting scenario, you may just see your handiwork, but it won’t be like the photos in the magazines. You really need to strip back the polish, and start from a lighter base.
Edit: https://www.lfgss.com/comments/13614524/
I also have a pair of chocolate-red Loakes that I did similar but that was from new on a very light tan, with a mix of brown and oxblood.
I'm certainly no expert but I am pretty sure many people around use different colors of creams to create depth and shades to shoes, with for example dark blue cream on black leather shoes, or even red/burgundy on brown shoes, which is why I was curious to see if anyone had advice or so around here.
The goal is to create nice tones, shades, and depth with color-ish reflects on the very dark brown, and as said not to change completely the color or try to re-color entirely the shoes, but I might have not explained so clearly