I dont see the aggregate being affected but to make sure, you could contact a custom concrete contractor in your area that does acid staining for advise. Most are willing to give advise to folks.

Another avenue if you have already purchased the stain would be to give a small area a test blast in an inconspicous spot.

I want to do the same thing... did you stain your aggregate patio? How did it turn out?

Great advice! Thanks for letting us know! I want to do it too.

@Wayne Reibold Do you have any close up photos of your before and after of the aggregate. Looks good from the photos you have but i am trying to do a tinted sealer over a white aggregate fireplace hearth. I dont want all the white to show through. Gray would be my preference. Would be nice to see what you were dealing with before hand to see if it would work on my application below?

I can't find any before pics. It's a semi-transparent tinted sealer so it adds subtle color not opaque but the more coats the more color.

Thanks Wayne. I am hoping that the white aggregate can be colored over and barely visible. Sounds like i will need at least two coats right?

No