I agree, I also see this all the time. Installers either dont mix properly or they mix a large patch and the solids settle to the bottom of the pail. You can opt to color the grout.
I have a fair amount of experience with this grout , I have used Latapoxys on nearly every marble job in the last 18 years. I think this is what I see, some installers will not mix the entire filler material contents with the epoxy, in order to make it easier to push into small marble joints,what can happen is the heavier colorant fillers sink, leaving the epoxy to float to the surface and cure, these epoxy's alone cure to that near beige color.You might try this,mix a 50% solution of TSP and take a toothbrush to a test area to see if the grout cleans up, If not , for me latapoxy removal and re grout is just not a possibility. hope this might help.Scott / Wilson Stoneworks IncIn a message dated 4/1/2011 3:53:29 A.M. Eastern Daylight Time, email@example.com writes:
What happened to this epoxy grout (exterior application)?
The grout put down was Laticrete Spectralock ProGrout silver, like the sample stick. Now 3 months later, it's faded to beige.
Has anyone ever seen this happen?