Miraculous insecticidal chalk

Anyone know anything about " Miraculous Insecticidal Chalk" from China?
Someone gave me a stick to use on my ants and the darn stuff worked great!
The insert says that it is not toxic to humans or animals, but it doesn't
say what it contains.  Looks just like a stick of chalk.  You simply draw a
few lines perpendicular to an ant trail and the ants go away!  No kidding!
I really want to know what the active ingredient is.  Can anyone help?

Nan

Nan Sterman, Master Composter in residency
San Diego County, California
Sunset zone 24, USDA zone 10b or 11


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