Can canners still trust the Ball Blue Book, cornerstone of the American canning canon?

Last August, the Iowa State University (ISU) Extension and Outreach—the arm of the land-grant university that works directly with farmers, business owners, and families on practical science applications—quietly informed 4-H members that canned goods made with recipes from the Ball Blue Book would no longer be accepted for exhibits at county fairs. A year later, the news that ISU Extension was no longer recommending the Ball Blue Book, not just to 4-H, but to any home canner, roiled the Canning subreddit, an online community with nearly 80,000 members.

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