What Exactly Is Blue Mold? What You Need To Know

Helen Skeates
Helen Skeates
12 min read

What kind of mold is blue? This mold can be found in various foods and other surfaces with a blue color.

Penicillium is a form of mold that produces blue mold. Isn’t that what you were thinking?

What Exactly Is Blue Mold?

Penicillium and Aspergillus molds combine to form blue mold.

People with a healthy immune system are not adversely affected by either the Penicillium or the Aspergillus molds. Individuals with weakened immune systems may only be at risk from ingesting this type of mold.

Blue mold is also one of the fastest-growing molds, according to experts. It can grow in just 48 hours and requires only the tiniest quantity of water to thrive.

Where Do Blue Molds Grow?

Any surface that has been damaged by water will be covered in blue mold. They’re most typically found on bread, citrus fruits, cheese, and a variety of other foods.

Is moldy food safe to eat? | HowStuffWorks

It is, of course, possible for it to flourish in your own home. It can be found in a variety of places around your property, including the walls, carpets, window sills, cupboards, and more.

This mold, as previously stated, grows extremely quickly. This is why it is critical to take preventative measures to ensure that your house is mold-free.

If you’re unsure how to identify mold in your house, don’t worry; we’re here to help. We can also assist you in preventing mold growth in your home.


In your home, you’re likely to run into a mold species known as Cladosporium. You may identify this mold by looking for dark olive-green spore clusters with gray and brown discoloration surrounding them. It often appears as a lighter shade of olive green, however this isn’t always the case.

Specifically, Cladosporium is linked to skin infections, ocular and sinus infections. Fungal meningitis, a form of brain infection, has been linked to it in some uncommon cases as well.


The Penicillium genus of molds is known for producing blue-green mold. Even though it can appear in a number of tints, the blue-green color is unmistakable, and it can range from deep green spores that have a blue tint to dazzling turquoise spores. Penicillium mold may seem navy blue with pastel blue and white discolouration surrounding it in some circumstances. In the absence of blue-green spores, you may see white as a sign of mold body that has yet to develop spores.

Aside from being harmful to your health, penicillium molds cannot treat illness in the same manner as processed penicillin. If you live in a home where blue-green colonies of mold are present, you may develop an allergy to this type of mold. Asthma and sinusitis, as well as inflammation of the lungs, have all been linked to it.

2 Ways To Locate Blue Molds

If you look hard enough, you’ll see mould on your food in no time. However, locating molds inside your home may be pretty taxing.

1. Finding molds on walls

Detecting mould in your food is a cinch. The process of identifying mould in your house can be arduous, however.

It is possible for molds to grow on both sides of the wall. After finding the mold outside, it’s a good bet that you’ll be able to figure out where the molds are inside as well.

Check out these simple methods if you want to learn more about how to find mold on walls.

2. Locating molds under your carpet

It’s easy for mold to grow on carpets since they’re often placed directly on the ground.

Mold can multiply in as little as 12 hours. So you need to be aware of the early indicators of mold in order to prevent it from spreading.

It’s a perfect environment for molds to grow because of the fabric’s qualities. The presence of mold in your carpet may pose a health danger.

Learn Food Spoilage in 2 minutes.

To find out if mold is forming under your carpet, follow these steps for identifying mold on your carpet.

How to Get Rid of Blue-Green Mold

Mold can appear in a variety of shades of color, including a blue-green hue in some cases. Cladosporium, aspergillus, and penicillium are just a few examples of molds that can seem blue-green. However, regardless of the color of the mold, the eradication process remains the same. Bathrooms and basements may be breeding grounds for mold. The quickest and most effective way to get rid of mold is to remove any existing growth and make sure it doesn’t return.

  1. If you have a strong mold infestation, wear eye protection and a mask or respirator that can filter out mold spores, such as an N-95 mask.
  2. Use a spray bottle loaded with water to dampen the moldy surface. Reduce the quantity of mold spores in the air and reduce the spread of mold and its accompanying health issues.
  3. A non-ammonia soap or detergent and warm water should be added to a bucket.
  4. Use a scrub brush dipped in the solution while wearing rubber gloves. Take care of the mold.
  5. A gallon of water should be added to a second bucket. Add half a cup of bleach to the mixture.
  6. Apply the mixture to the surface with a sponge. Allow the solution to sit for at least 15 minutes before removing it.
  7. Remove the solution by wiping the surface with a sponge drenched in clean water. Use a towel to wipe the surface dry as much as possible. To speed up the drying process, place a fan immediately on the surface.


How much moisture each cheese retains, as well as when its rind is peeled, determines its character and flavor profile. Red meat and sauces benefit from the tanginess that comes from using varieties with a high moisture content.


Gorgonzola, which has a distinctive appearance, can be used in a variety of dishes, including risottos, pastas, and pizzas. On a cheese board, the white and blue marbling looks great with grapes, honey and pistachios.


This decadent blue mold cheese has a delicate and luscious creaminess, as well as an intricate flavor. A velvety texture and a somewhat saline taste characterize the Castello Creamy Blue.

Grapes, honey, and red wine go well together.


A blue mould cheese made from sheep’s milk, this French classic is complex and intense. Its body is moist and laced with small blue pockets, providing a blend of sharp and tangy nuances. Vibrant and full of character, Roquefort made blue mould cheeses popular for a reason.

This French cheese, which is manufactured from sheep’s milk, has a rich and powerful flavor. There are strong and acidic undertones to its wet and blue-flecked body. Roquefort made blue mold cheeses popular for a reason: it’s vibrant and full of personality.


The flavor of a blue Stilton is something to behold. The creamy and nutty flecks open with a delicate aftertaste. Throughout its body, tiny veins run like rivers, giving it the appearance of an intricate mosaic. Stilton is a robust and powerful cheese that is less wet than other blue mold cheeses.

Sliced apples, honey, and walnuts are a delicious accompaniment.


Danish Blue has a rich, creamy flavor and a silky texture thanks to its use of milk from local cows. The opening of blue mold cheeses is gentle, but the flavors deepen as they linger.

With fresh pear and citrus fruit, as well as walnuts,

What Are The Risks Of Blue Mold?

The following information is all you need to know if you or a member of your family has been inhaled or ingested blue mold.

Allergy-like symptoms can be induced by inhaling mold spores. Immunocompromised individuals may experience life-threatening complications.

Different reactions are elicited by the two forms of blue mold, which are distinct from one another. In general, Penicillium is considered safe and does not pose a significant risk to health.

If you’re concerned about your health, Aspergillus blue mold is the culprit. Aspergillosis, a potentially deadly disease, can be triggered by it.

What happens when you eat moldy bread | The Times of India

If you’d want to learn more about the dangers of blue mold, go here. Then mention the health dangers that mold poses to you.

How to remove blue mold from bathroom walls

No matter what color the mold is, the removal process is the same. A mold’s color has no bearing on its health effects. Non-porous surfaces including metal, glass, bathtubs, toilets and tile floors can be cleaned with household detergent if the blue mold has spread to more than 10 square feet in an area.

Because porous materials like drywall, ceiling tiles, insulation, and carpet are difficult to clean completely of mold, they should be removed and replaced with new, clean ones. During the mold removal process, extreme caution should be exercised to avoid contaminating adjacent portions of the house. We recommend hiring a mold removal company if the blue mold spans more than 10 square feet.

Make sure that even though you can see apparent mold, there is no concealed mold in the walls. According to the 80/20 rule, only 20% of the mold is visible, so if you notice 5 square feet of mold on drywall, there could be another 20 square feet of mold growth hidden beneath it.

Health effects of blue mold on bathroom wall

It is important to note that the color of mold does not indicate whether or not the mold is hazardous to human health. Generally speaking, all molds should be considered possible health concerns and should not be permitted to grow in populated environments. Mycotoxins, which are harmful chemicals produced by Aspergillus and Penicillium species, are well-known. Mycotoxins are dangerous to both people and animals because of their toxic properties. People who are susceptible to mold spores, particularly those from blue mold, may experience allergic reactions if they inhale them.

Where does blue mold come from?

  • The orchard floor, the soil, and possibly dead tree bark are all possible habitats for this organism.
  • Conidial spores can be found in the air, as well as on fruit’s surface.
  • Spores are able to grow at temperatures as low as 32°F and can persist for lengthy periods in poor environments.
  • There is a high probability of contamination in bulk bins, field crates, packing lines, and storage rooms.

How do I prevent blue mold?

  • To clean up rotting fruit and organic material from the orchard floor, sanitation is required.
  • Good harvesting and handling practices are necessary to avoid fruit punctures and bruising.
  • To prevent the spread of disease, the water in the dump tank and flume must be disinfected.
  • Fungicides or steam can be used to sanitize picking bins and cartons.
  • Fruit dips can be infused with disinfectants or fungicides, which can then be applied with wax.
  • Temperature-controlled chilling and storage of fruit.


Mold can harm your health as well as the structure of your house. You and your family could be put in even more risk if the walls are damaged.

Once you’ve located the mold, you’ll need to hire a pro to remove it. The removal of mold necessitates a lot of time and effort.

After reading this article, you should have a better understanding of what blue mold is and the potential health hazards it poses. In addition, you’ll be able to pinpoint exactly where they’re growing in your home.

The easiest way to get rid of them is to hire a professional pest control company.

Helen Skeates

Helen Skeates

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