I visited our local Mennonite bulk sale store & bought a product called Therm-Flo. They also had Clear Jel available but the sales person told me that the Therm-Flo was what they used in canning. The package does say canning & freezing. BUT when I looked on the gov. site, Clear Jel is the only one mentioned. Is anyone familiar with this? There's so much said about thickening products like flour, etc. being dangerous to can with--I don't want to make a fatal mistake.