Subscribers’ Q&A: Can we cover our containers while heating and holding? Is colloidal silver a preservative?

In the June Q&A, Charlette asked: I never hear other people doing this–but does anyone ever cover their water phase while it’s being heated/held? I have a small glass sauce pan cover that I wash real well and swipe with alcohol so it’s clean and use it to cover the water phase. I have also used…