You make a beautiful mosaic, grout it, and then the next day there is white powdery streaks running down off of the grout. What a mess! What is this white stuff? How do I get rid of it?? The white stuff is called efflorescence. It happens most often when you apply grout in moist and cool conditions. In my case, I grouted between rains when it was foggy but dry. The fountain showed no signs of white streaks and was sent out on a truck. A few days later I went down to do finishing touches on it and saw this:
![Grout Efflorescence on mosaic dragonfly efflorescence](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgOU6C2GNZh3GftuLfDRVlB44MdLHnz4TmJOYVmZr-1S9wFfLwg_z47SU8gdLdKdcRrrG5Avo6V1rjZLUkAWqaDHQZ5XUbbF0JEefI8h3HFUzwFfEkXR6Z4PqwALlbZyF9VcP6GQxBKxco/s640/efflorescence.jpg) |