Food Science: When Good Carrots Turn Green (2024)

Emma Christensen

Emma Christensen

Emma is a former editor for The Kitchn and a graduate of the Cambridge School for Culinary Arts. She is the author of True Brews and Brew Better Beer. Check out her website for more cooking stories

updated May 12, 2022

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Food Science: When Good Carrots Turn Green (1)

And this time we’re not talking about “environmentally-friendly carrots”!

If you’ve ever sliced into a freshly-baked carrot cake only to find that the shreds of carrot have turned green, you will probably agree that this is a rather disconcerting experience, to say the least.

Why does this happen and is our cake safe to eat? For these answers and more, read on!

Harold McGee, author of On Food and Cooking, explains that carrots turn green when the batter “contains too much baking soda, or when the soda isn’t evenly mixed in the batter.”

Carrots contain pigments that are sensitive to changes in pH balance. When the shreds of carrot come into contact with the alkaline baking soda, a chemical reaction takes place that causes the pigments to change color.

Ipso facto, green carrots!

If your carrots turn inexplicably green with a recipe you’ve used many times before, the likely culprit is that the baking soda didn’t get fully dispersed throughout the batter.

If your carrots are turning green every time you make the recipe, the ratio of baking soda in the recipe is probably off. Try reducing the amount by a quarter teaspoon next time you make the recipe.

Unappetizing though they may be, cakes and loaves with green carrots are perfectly safe to eat and taste no different than normal cakes!

Blueberries, sunflower seeds, and walnuts are also reactive to alkaline environments and experience similar color changes when the amount or distribution of baking soda is off.

Have a food science question? Let us know!

Related: Graffiti Recipes: The Secret Carrot Cake of Pasanen

(Image: Flickr member .marn licensed under Creative Commons)

Food Science: When Good Carrots Turn Green (2024)

FAQs

Food Science: When Good Carrots Turn Green? ›

Harold McGee, author of On Food and Cooking, explains that carrots turn green when the batter “contains too much baking soda, or when the soda isn't evenly mixed in the batter.” Carrots contain pigments that are sensitive to changes in pH balance.

Can you eat carrots that have gone green? ›

Yes - that's just chlorophyll same as in any green vegetables. They were exposed to light due to not enough dirt cover. You can eat the carrot tops as well. Saute in olive oil with garlic and red pepper flakes or chop and use in soup.

What causes greening in carrots? ›

Greening of the top of the carrot is caused by sunlight. Heavy rain can wash away the soil from carrot roots exposing them to the sun. An off-flavor is often associated with this green color. Remove the tops before consuming or canning the carrots.

Why did my cake turn green? ›

When blue food coloring is added to this yellow base, the batter turns green. Moreover, food coloring is known to darken. This means that as the cake bakes, its emerald tinge will become even more apparent. Thankfully, there are measures you can take in order to avoid green baked goods.

When should you throw out carrots? ›

If your carrots feel slimy and look discolored, are wilting or soft, or show signs of mold, they should be tossed. The white blush on carrot skin is OK to eat—it just means the carrots are drying out and need water.

Can you eat the green tops of fresh carrots? ›

And the carrot tops (AKA greens, AKA leaves) have a similar nutritional profile to carrots; they are rich in vitamin A, C, K, and potassium. Don't toss those greens. Reduce food waste by using the whole carrots and their leafy tops. Carrot tops can be used in soups, salads, and pesto, and you can also saute them.

Why did my cooked carrots turn green? ›

If your carrots are turning green every time you make the recipe, the ratio of baking soda in the recipe is probably off. Try reducing the amount by a quarter teaspoon next time you make the recipe.

What do green carrots mean? ›

Simply, this green colour is. caused by the sunlight reacting with the chlorophyll in the exposed carrot. Basically photosynthesis has occurred.

How to know when carrots are ready to harvest? ›

Firstly, check the top of the carrot root; if it is 3/4 to 1 inch in diameter then they should be ready. Secondly, gently tug on the bottom of the stems; if they pull up easily then they can be harvested. Additionally, look at the greens above the soil – they should measure 10 to 12 inches tall before harvesting.

How do you know if carrots are too old? ›

How to Tell if Carrots Are Bad. Carrots that have spoiled or gone bad will usually have an odor, a slimy texture, or dark discoloration. They may also be wilted or soft. If you see mold growing on carrots, throw them out.

What is the best fertilizer for carrots? ›

Composted Manure: Rich in nutrients and organic matter, composted manure is an excellent all-around fertilizer. It should be well-composted to avoid burning the plants. Bone Meal: An excellent source of phosphorus, bone meal promotes robust root development in carrots.

What does white vinegar do in cake? ›

When vinegar reacts with baking soda, it creates carbon dioxide bubbles, which act as leavening agents. So as the batter bakes, these tiny bubbles expand, causing the cake to rise and giving it that light, airy texture we all love.

Why does my cake smell like ammonia? ›

Ammonium carbonate turns to 3 gases when heated: ammonia, carbon dioxide, and water vapor. No powder residue remains in your baked goods after baking, but not all of the gases escape, which means a bit of an ammonia odor can linger for a while. Once the product cools, the remaining gases will evaporate.

Why is my carrot cake black? ›

I found that some metal pans would discolor my cake. And the longer the cake is left in the pan it would effect the flavor as well. Hope this helps someone.

How do you know when carrots are too old to eat? ›

Carrots that have spoiled or gone bad will usually have an odor, a slimy texture, or dark discoloration. They may also be wilted or soft. If you see mold growing on carrots, throw them out. The white blush that forms on carrots signals that your carrots are drying out.

Should you store carrots with the green tops? ›

As soon as you get home, cut the tops off of your carrots, leaving about one inch of stem. If left intact, the herbaceous carrot tops will draw moisture from the root, drying it out faster.

Is it safe to eat immature carrots? ›

Most of that wholesome beta carotene is found in the skin and outer portions of the carrot. It's estimated up to 30% is lost in processing of baby carrots. But, eating carrots — baby or not — is still good for you and much better than many alternatives.

Should I throw away slimy carrots? ›

Carrots that have gone bad have an off smell, slimy exterior, and can sometimes be rubbery or bendy. Once they've reached this state, unfortunately, they can't be brought back. To the compost bin they go!

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