In this forum, you have to use the HTML code. :-) As for the answer to your question, the link below will take you to the answer to your prayers. :-) Not only will you get a uniform color, but the grout will also be permanently sealed, and next to impossible for dirt to stick to it. From the looks of your pictures, it appears to be incomplete mixing, but I couldn't swear to it. Here is a link that might be useful: Aquamix Grout Colorants on line

A better product in Custom is Prism grout..... very color consistent.....it’s a fast setting cement based grout......very Consistent if you follow manufacturers instructions..... Or Fusion Pro from Custom is also consistent.... both are more expensive but so is doing it three times

When you see a poor tile installation, it is a red flag that the tile setter is not as skilled as he should be. Therefore the pros on here will always ask you to find out how the shower was built, especially what waterproofing materials and methods were used. You should probably ask your tile setter that question today.

Here are a few quick tips to find out how "correct" the install is (or isn't). Correct meaning 'will not fail' vs. looks pretty. Looking pretty and being correctly installed are two different animals. 1. Caulking is used at EVERY change of plane (ahem...corners). Grout is NOT allowed when tile goes around a corner or goes from flooring tile to wall tile. To check for caulking just poke your finger nail in there and push. If it feels rubbery = caulking. If it feels like hardened sand/stone = grout. **Hint** Look at the GROUT that is sitting all around the wall cubby and the grout that is running down the corner...check the marble floor/tile wall connection. Do you see more grout? 2. Did they use wood (raw wood) at the shower threshold? If you remember seeing a plank of timber being 'tiled' you have issues. 3. Water Draining out of the shower should be even. The shower floor should not have areas that are left 'wet looking' (ie. darker...marble is AWESOME at showing this...which means you can test this very easily for yourself) for hours while other areas look 'dry' very quickly. An uneven drying time tell us water is SITTING (ie. not draining) under the marble. Issues like a mentioned above can be a perfect storm waiting to come crashing down (through the ceiling? below?) around your head. They are also issues that point to a REDO (especially the shower floor stuff). The uneven wall tiles = uneven wall. They needed to shim the walls (when the studs were exposed) and/or float the tile (very difficult and expensive and requires an OLD FASHIONED Tile Pro to get it done properly). You didn't get either. In other words your General Contractor used 'guys' to lay the tile and not the EXPENSIVE Tile setters (ahem...GCs HATE using expensive pros...it messes up their bottom line/quotes).