Yes. When I originally purchased my oxblood Daltons, the color was brand new and my SA instructed me to use merlot polish on them.
Warning: Spoiler! (Click to show)
A few weeks later, when I was back in the store, I was then instructed not to use merlot polish, but to use AE's black polish instead, so the next time I polished them I switched as-recommended and it did change the color:
Despite being taken in completely different light conditions, the color differences are decently represented in the above pics. Ultimately, the merlot polish added a purple hue to the leather. I honestly didn't mind the merlot-polished boots, and definitely received constant compliments on the color, but the black polish kept more of the true, dark-cherry "oxblood" color that I wanted when I bought the Daltons.
Hope this helps.
Both look amazing!
But I'm really digging the merlot polished version. Very tempted to get a suitable oxblood shoe and merlot polish to try to replicate that myself...
How versatile was it for matching - similar to true merlot shoes? The pictures looks like it has a lot of the purple hue but it could just be the lighting.