Beyond their health benefits, blueberries are a breeze to bake with because the only prep they require is a quick rinse. However, there's one small step you can add to your baking-with-blueberries routine if you want to make their already-gorgeous color a little more vibrant: Alter their pH with a little bit of lemon juice.
When the berry's skin mixes with a base, like baking soda, it will turn a blue-green color. And when the berry's skin mixes with an acid, like lemon juice, their pH is lowered, and their color turns toward a show-stopping, deep purple and blue hue.
However, for many recipes, you can't just omit baking soda, since it plays a big role in letting baked goods rise in the oven. This is why leaving lemon juice out of your blueberry bakes is a major mistake, because you might just end up with a batch of not-so-pretty green and gray muffins.
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