Why do potatoes turn black?

In the brief guide, we are going to answer the question ‘Why do potatoes turn black’ with a detailed analysis of what safety measures are to keep in mind when preparing it.

Why do potatoes turn black?

Diseases cause potatoes to turn black in the soil (such as Blackleg, Early Blight, or Late Blight). Due to mold or Hollow Heart, brought on by a lack of air, potatoes turn black when in storage (caused by storing wet potatoes). After being cooked, potatoes turn black because an acid included in the tubers oxidizes.

What causes a potato to turn black?

Plant disease

It is the most frequent cause of a potato becoming black while it is still underground. Some potato plant diseases, such as Blackleg, Black Scurf, Early Blight, Late Blight, Pink Rot, and Soft Rot, can make potato tubers turn black. Bacteria, viruses, or fungi are all potential causes of potato illnesses.

Poor storage

Black Heart, which is brought on by a lack of oxygen during storage, can cause potatoes to turn black within. After harvest, storing potatoes while they are still damp increases the chance of black mold developing on the outside.

Cooking and air exposure

Even healthy, well-stored potato tubers can become black following cooking and air exposure. If potatoes are steamed or cooked before being peeled, they are more likely to become black after cooking. After the potatoes are cooked and exposed to the air, an acid (ferri-chlorogenic acid) oxidizes, which is the cause of this.

What are the causes of cooked potatoes turning black?

The cause of cooked potatoes becoming black. The acid in cooked potatoes reacts with airborne oxygen (oxidation). Its name is ferri-chlorogenic acid (which contains iron). After boiling or frying, the ferri-chlorogenic acid in potato tubers oxidizes.

Can you eat black potatoes?

The potato is still safe to eat even if it has suffered frost damage. You can cut around the black design if you find it unpleasant and utilize the lighter-colored portions for your meal.

How does a black potato look?

Dark markings on the potato’s exterior or interior can be harmful. When you notice something that might be an illness or rotting, it’s critical to use your other senses to determine whether the potato is safe or not.

It’s better to just throw away a potato if it has a bad odor, a mushy texture, or sections that clearly show signs of infection. To determine whether your veggie has been spoiled or not, use your other senses.

How are potatoes stored?

Proper potato storage will increase shelf life and guarantee food safety. One of the greatest ways to stop potatoes from turning black inside is to keep them in ideal conditions.

Wash your potatoes properly before starting the storing process. Remove all observable soil, and then inspect the skin for any injuries. Spend some time drying your potatoes after cleaning them before storing them.

Use potatoes that have obvious damage as soon as possible since they are most susceptible to infection or more harm. Don’t keep these potatoes in storage for too long.

It’s time to store your potatoes now that they have been cleaned and dried. When storing your potatoes properly, there are three things to take into account. These elements include time, humidity, and temperature.

Finding the ideal location in your kitchen to achieve the ideal temperature and humidity may be difficult, but you should make the most of the space you currently have to achieve the greatest outcomes.

What degree of heat is ideal for potatoes?

Don’t put your potatoes in the fridge. Keep in mind that when you store potatoes in a chilly environment, dark spots of frost damage become visible.

Potatoes should be stored at a temperature of between 40 and 65 degrees Fahrenheit. Make sure you set aside a suitable space in your home to maintain this suitable temperature for your potatoes.

Make sure the temperature doesn’t rise too high as well. If the temperature is high enough, bacteria on your potatoes will spread more quickly if they are growing. Low temperatures prevent bacteria from spreading.

Your potatoes can be stored in a box or a basket that is covered to block off the light. Your potatoes will start to sprout and turn green when exposed to light.

What can be done with potatoes?

A dizzying array of dishes that use fresh potatoes include mashed potatoes, potato pancakes, potato dumplings, twice-baked potatoes, potato soup, potato salad, and potatoes au gratin, to name a few. Fresh potatoes can also be baked, boiled, or fried.


In the brief guide, we discussed answering the question ‘Why do potatoes turn black’ with a detailed analysis of the safety measures to keep in mind when preparing it.


Hi, I am Charlotte, I love cooking and in my previous life, I was a chef. I bring some of my experience to the recipes on this hub and answer your food questions.