Dear Peter,
We do not recommend re-using the Atlas-Mason jars used to package our Classico Sauces. A coating is applied at the glass plant to reduce scratching and scuffing. If scratched, the jar becomes weaker at this point and can more easily break. This would increase the risk of the jar breaking when used for canning. Also, the lighter weight of our current jar could make it unsafe for home canning.
Should you have any additional questions, please don't hesitate to contact us at 800-255-5750.
Heinz Consumer Resource Center
Heinzconsumeraffairs@us.hjheinz.com