I bought the chalk at a hardware store (not a Home Depot), but a smaller hardware store.

The box is about 3 1/2 X 1 X 1/2" It is orange and black and in a yellow area it says MADE IN CHINA.

It is called Miraculous Insecticide chalk........safe for humans and animals.

It worked great....but someone later told me that it is the chalk that works because the ants don't like it on their feet. I think that ants use their feet as sensors.

So probably regular sidewalk chalk would work just as well. Although I have noticed that this chalk is denser than regular chalk - more like a carpenters chalk.

I could get some and mail it to you if you wanted to try it.

I used the ant hotels too, but I noticed that my ants just walked around them