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Mary Ann, it'll help if you'll keep all your project questions on one thread so folks can see what you're working on and what's been previously asked and answered. A moderator can give it a more generic title if you'd like to suggest one.
I hope you rinsed that grout very, very well after the vinegar. Any acid on a cementitious grout is to be avoided, and the tile industry recommends you not use an acid cleaner on grout for at least ten days after installation. I expect the colorant wants the grout surface very clean and free of contaminants, too. And very dry.
I would recommend you apply your colorant before installing the caulk.
My opinion; worth price charged.
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