On May 29, 6:46*pm, Janet Bostwick > wrote:
>
> You are incorrect. *It may have been true 50 years ago as varieties
> were more acidic. *Today's' hybrids don't carry the same acid profile.
> You'd better check the USDA guidelines or the Ball Bluebook.
> Janet US

Well, I sit corrected, and surprised. I've always canned Roma
tomatoes and never had a problem. I certainly can imagine yellow
tomatoes being less acidic. Maybe in future I should be more careful
and test the pH.

http://www.richardfisher.com