If we choose this does it need to be sealed? Does sealing change the color or appearance?
We have a split face travertine backsplash. We did not seal it but in the almost two years since we have it it's still looks perfect. But we do not do a lot of frying or splattering when we cook, if we did I think we would need to seal the travertine for sure.
A regular sealer does make the stone deeper and more golden. There are sealers available though that have a minimal effect on the color. Wet the tile and see which way you like it better.
We used the sealer recommended by Arizona Tile where we bought our travertine. We didn't notice that it changed the color of either the tile or the grout.
I used a sealer that did not really change the color at all. If you don't want a change, get one that is just a sealer not an enhancer. Test it on a scrap of the backsplash.
I have travertine and I'm glad I sealed it. I like not having to worry about splashes and stains.