OMgoodness!

Well, you could make a deal that you'd be willing to try the epoxy colorant/seal, but if you aren't satisfied, it all must be redone... Or, you could just have it redone.

The quicker it is taken out, the easier it will be because it won't be as cured.

Grout stain was taken off the market many years ago because it was toxic, especially the dark colors.

Grout colorant is really an epoxy paint. It is still going to have a painted look. It does seal the grout but it will eventually wear off in a couple of years. I do not know how well it will stand up to heavy cleaning and scrubbing and cleaning chemicals. It will be hard to make it look good around all of the pebbles.

I used grout colorant in my house to cover a light color grout (bad decision on my part) that did not look good under heavy traffic. It kept me from having to regrout most of my house. It has made cleaning much easier because the grout does not absorb the dirty water when I mop. I have a lot of dogs in my house. If I were to do it over, I would install grey grout. I used black epoxy grout with my wood looking tile in two bedrooms and it is wonderful to mop, especially after puppies.

Sorry, I vote to redo shower floor with black or charcoal epoxy grout.

This post was edited by Anna_in_TX on Thu, Mar 20, 14 at 10:03

Oh dear.

I really think you should have them take it all out and re-do -- any grout colorant will just be a paint, in effect, and a shower floor gets some heavy usage.

Surely the contractor will take the blame for this and swallow the cost of redoing the floor, since it's pretty clear very few folks would choose pink grout with black stone..?

Is this the same contractor who tiled the other bathroom with mistakes? The same contractor who didn't notice the grout was pink when it was first mixed? The same contractor who didn't bother to double check the color with you and applied it anyway?
I agree with all above, get the doofus to re-do your shower--at his expense and double check everything each step along the way.
I tried coloring grout once, many years ago. My results were not great. The color it came out wasn't even remotely close to what I wanted.

When I set pebble-style sheets, I almost always pull off a portion of the perimeter pebbles and rotate and reset them by hand. Doing that blends adjacent sheets together into a seamless look and eliminates a the sheet lines that you can see telegraphing through in your floor.

If you want to keep your pebbles "as-is", then a charcoal colorant is the only color I'd recommend as the grout will blend with your pebbles and hide those sheet lines. So I agree with your choice of color.

Aquamix Grout Colorant is the colorant I recommend. It is epoxy, it's a fine product. Colorants can be screwed up, so I'd have a get-together with the folks at the tile shop and with your installer. Tell them you're willing to try the colorant, but if you're not satisfied with the results you'll retain the option of having the entire pan R&R'd at no cost to you.

If they hedge, have them R&R it now and get a better pebble installation and the proper grout color in the process.

Good luck with it.

Right now the floor looks like it's covered with peach mildew.

Mongoct, your description of peach mildew is spot on. Yuck!
We tried an epoxy stainer, but it just looked like a black, clumpy mess so we are redoing the tile. And now that you mentioned it, I do see the sheet lines--I couldn't even see them before because the color was so dramatically awful. I will ask installer to do that with the pebbles. Cross fingers this time it will work.

And yes, this is the same contractor who has messed up a bunch of stuff. He has made right on a lot of it, but not without teeth gnashing, repeated requests, and genuine bafflement on my part.

Today's job, however, is to get the granite installer to come back and redo one of the seams for our kitchen counters. It never ends!

I am about to redo the grout lines in my epoxy-grouted kitchen with the Aquamix Grout colorant due to a bad grout job.

It costs about $25 for a bottle and it covers 200 SF. There are different prep instructions for new grout vs old grout which you can read about on the Aquamix web site. The colorant can be applied with a toothbrush or paintbrush so they shouldn't have trouble getting into the nooks and crannies and going light to dark is better than going dark to light! I guess I would try the grout colorant first before having them rip out the shower bed. And if I remember correctly the Aquamix product is more of a stain than a paint so it looks more natural. At least I am hoping it does - my floor depends on it!

I'll bet this stuff will turn that Cranberry into Charcoal, and if you have to apply it every now and then, you've got plenty:

Here is a link that might be useful: Tenax