They all have those sample boxes. It should be easy to figure out which one it is at a tile store. I can't remember which brand(s) were black. There seem to be only two or three go to brands that are popular around here and carried by most stores. They let you take little sticks home. So, take all of the similar colors.

Problem with the grout in my house (two different installers) is that they often use too much water so the color actually washes out. They do not match the samples at all!

It is also very hard to get another batch to mix up exactly the same even from the same bag depending on the amount of water used (who mixes it, they do not follow directions!). There are likely pigment variations with lots too.

Thanks, Snookums, for the advice. At least there do not seem to be as many grout colors out there as there are paints!

I have several sample boxes at home and recall that Laticrete's is black. Did it look like this?

Yes, they only have a few selections in a range as I recall. I know the type colors I was choosing were very limited. So it shouldn't be hard to spot. Excepting for if your color came out as it was supposed to or not. Then you might have to look at another brand, which I did for a closer match.

Thanks everyone!