You Asked It!

White Spots on Home Canned Blueberries

Blueberries
Photo: Oregon State University. This blueberry is after canning.

Blueberries have a natural defense system on their skin to help make them resistant to mold. The skin has a high wax content.

In this picture, notice the little white rings? It looks like white bloom, similar to what happens to chocolate when it is temperature abused. Those white spots are melted wax from the blueberries that melts at a temperature of at least 140°F. When canning fresh blueberries, the wax melted, then re-solidified during cooling leaving the little white rings. Reheating should melt it again.

This is not harmful and is a natural component of the fruit.

Source: Oregon State University Master Food Preservers

 

About Karen Blakeslee

The Rapid Response Center was formed in 1995 as a resource for Kansas State University Research & Extension Agents. Resource topics included Food Science, Human Nutrition, Food Service, Textiles, Home Care and other consumer topics. Since that time, the Center has grown to be of valuable assistance to Kansas State University Extension Specialists in those areas.
5 thoughts on “White Spots on Home Canned Blueberries
  1. After reading so many articles, I finally found this content. It really answered my needs. It’s amazing. I want to read every article you write. It’s interesting and informative that I’ve never read before. You’re great. 123win

  2. It’s an article that really grabs me and I can’t stop reading it. I’m going to read every single thing you write. You can trust me on that. Not many people have the ability to write such articles. and you are one of them Your article is very good, you know? 123bet

Leave a Reply

Your email address will not be published. Required fields are marked *