The pH scale references actually comes from Clemson University Extension publication. You can find a similar graphic from the Oklahoma State Extension publication on Importance of Food pH for Commercial Canning. Both graphics provide a good representation of common foods and where they fall with regard to pH. The pH scale is not an endorsement of foods to preserve by water bath and pressure canning. (It is not safe to process milk and milk products in a pressure canner.) We’ve added a caption clarifying the purpose of the graphic.
The pH scale references actually comes from Clemson University Extension publication. You can find a similar graphic from the Oklahoma State Extension publication on Importance of Food pH for Commercial Canning. Both graphics provide a good representation of common foods and where they fall with regard to pH. The pH scale is not an endorsement of foods to preserve by water bath and pressure canning. (It is not safe to process milk and milk products in a pressure canner.) We’ve added a caption clarifying the purpose of the graphic.