Replacing A Cracked Ceramic Tile

9 days ago I found a stack of spare tiles in the basement, belonging to our condo.  I grabbed one and used it to replace the cracked tile in the master bathroom:

       

The grout in this area of the bathroom is a mix of original grout and replacement grout.  The replacement grout has always been too dark.  I used a grout-removal tool to scrape out the old mis-matched grout & a cold chisel and ball peen hammer to chip the remaining mortar chunks out:

      

       

It appears we have Schluter Ditra “uncoupling, waterproofing, and vapor pressure equalization” membrane underneath the tile.  Once everything was cleaned up I used a little container of Tile Repair Mortar [which I found at Home Depot this weekend]:

I slathered it on the membrane and the back of the tile:

       

I smooshed the tile down firmly – instant improvement!:

       

I let the new tile sit for a few days to make sure the mortar had time to set.  While I waited I researched different types of grout.  I decided to use PolyBlend “Simple Grout” in Delorean Gray, which is a light-weight, pre-mixed sanded grout:

I used a grout float to spread it around the replacement tile.  Once I sponged off the excess it looked as good as new:

        

Once the grout dried I decided to try out the bottle of PolyBlend Grout Renew I bought last year.  It comes in tons of colors and you paint it on over existing grout to re-hue and re-seal it.  Score!  The bottle suggests using a toothbrush to apply it, but I used a small paint brush:

       

I learned about this product on the YoungHouseLove blog, and it’s incredible what it can do [before & after]:

       

It’s it a little grey-er than the original grout, but it’s a lot closer than the dark grout was.  I also touched up the dark grout lines in the laundry room [before & after]: