My vote is white it will keep the marble looking pristine and will darken a bit over time matching the look of natural carrara quite well.
Marble color change thinset.
What type of thinset to use when installing marble tile.
For most installations a modified thinset such as the 703 or 710 is recommended.
Step 1 examine the tiles for thickness and color.
I remember doing a carerra repair in a shower a few years back.
White thinset is always used on light colored marble you used the right stuff.
What color thinset does he she use.
Often the choice of thinset color simply comes down to the grout color selection.
I guess i will never know how much the grey thinset affects the overall color.
When installing tile in your home you can use a variety of products to adhere the tile to the substrate.
For instance if you are installing granite tiles and have selected a gray toned grout color gray thinset is a good choice for installation.
I hear it quite often dark grout can sometimes seep into the sides of a light marble and stain it causing it to look dingy overall.
When you combine that with the color change it looks like you intensionally picked a different color for the bottom row to create a border between the large vein marble squares above and the multi colored small tile on the floor.
For instance different kinds of.
Jack nov 28 13 at 23 37.
Most of the tile was white but there were some gray in the lot.
Definitely stay with a lighter color for marble.
Light weight thinset such as merlite 820 is less likely to sag if used properly.
I noticed that the bottom row if tile are not full size tile.
A light weight thinset is commonly used on walls.
I am not sure why white thinset was not used nor did i even think to ask.
Don t forget to select the correct trowel size.
It is common for marble to change color as the cement dries and cures.
How long do you let it dry out after it is installed.
For rectangular plank tile use a medium bed mortar such as 720 marble pro.
Give it a few days it will turn back to the dry color.
If the tiles arent from the same lot the likely hood of a match decreases.
I see ditra around the niche you planning on running ditra in the east of the shower.