Tile fiasco

After the grout in the master shower dried, the stones had turned a shade of brown.  There is no brown in our shower!!  So I called the tile store to see if this was a defect of some sort, and they said that it was an installation error.

Turns out that if you use epoxy grout, it'll be absorbed by porous materials such as stones (which is what we have).  You need to pre-seal the material before applying the epoxy grout otherwise the material color may change.   And once the epoxy is sucked into the material, you cannot extract it.

Needless to say, we need to redo the master shower floor.  Booooooo...

Brown pebbles versus original grey pebbles

What our master floor should look like