How to Identify Mold Type By Color – Colors Of Mold

Updated on 21-Nov-2024

Identifying Mold Types by Color

Mold comes in all shapes, sizes, and colors, and while some may think that color can serve as an identifying characteristic, unfortunately, it is not.

The main means of identifying molds involve looking closely at the structure, spore, and growth morphology, which isn’t easily done without access to a lab.

Color isn’t a good distinguishing characteristic of mold or toxicity because one patch can have multiple colors or change color for several reasons.

Some factors that affect mold color are:

• Food source
• Humidity level
• Light exposure

Regardless of what color a mold is, if it’s in your house, [Common Types of Mold Found in Toronto Homes] that’s a sign that there is an active moisture problem and it should be removed as soon as possible so the moisture problem can be fixed.

Here’s a guide to mold colors that you might find in your home.

Understanding Mold

Mold is a type of fungus that thrives in moist environments. It can grow on various surfaces, including walls, ceilings, and floors. Different types of mold have distinct colors, which can be a useful indicator of their species.

Common Mold Colors and Their Types

Green Mold

Green is the most common color for mold. There are hundreds of thousands of types of mold and thousands of them appear as green at some point during their life. So when it comes to green mold, the color won’t tell you much, but chances are that it’s one of these three:

• Aspergillus: A common fungus that studies suggest you actually breathe in every day. Exposure in large amounts can result in aspergillosis and other respiratory problems in those who have pre-existing conditions.
• Penicillium: Another multi-color fungus that can sometimes be green. The discovery of the Penicillium genus served as a monumental step in the medical field as it led to the creation of Penicillin. It can be found on food and walls in homes with high humidity and while it is an important ingredient in Penicillin, it can cause serious allergic reactions if improperly handled.
• Cladosporium: Usually grows outdoors on decomposing leaves. It can find its way indoors and colonize walls, insulation, and carpet, and exposure can sometimes lead to skin rashes, eye irritation, and sinus infections.

Black Mold

Black mold is an infamous member of the mold family, but not all black molds are the toxic black mold. While it’s important to deal with all molds as soon as possible, dealing with toxic black mold should be handled by a professional.

There are several different kinds of black mold that can be commonly found in a house, so watching out for certain characteristics can give you an idea of how urgent its removal is.

• Stachybotrys chartarum: The infamous toxic black mold. It often appears as black or greenish-black in color and can be found growing in leaky areas, old decaying wood, paper, and foods. S. chartarum requires constant moisture to maintain growth, so the quicker these areas are addressed, the less of a threat it will be. You may find black mold inhabiting your basement after a flood or around a roof leak. The reason S. chartarum is so dangerous is that it produces a fungal by-product called a mycotoxin, which can be ejected into the air and inhaled by humans and animals. Studies [Here] show that exposure to indoor toxic mold like S. chartarum accounts for far more deaths in the U.S. than previously thought. Exposure to mycotoxins like those found in S. chartarum can result in headaches, sneezing, coughing, rashes, and sometimes even blood poisoning.
• Alternaria: It’s crucial to be aware of the possibility that a black-colored mold could be S. chartarum, but there’s a good chance that it’s Alternaria, which is much less dangerous. Alternaria species usually grow outdoors in dusty, damp areas near plants and soil, although recently they have been found growing in houses. Exposure to Alternaria could exacerbate asthma, but other than that, it doesn’t pose many health risks.
• Aspergillus: Another common fungus that studies suggest you actually breathe in every day. Exposure in large amounts can result in aspergillosis and other respiratory problems in those who have pre-existing conditions.
• Cladosporium: Black-colored mold in the home can also be a species of Cladosporium mold, which usually grows outdoors on decomposing leaves. It can find its way indoors and colonize walls, insulation, and carpet, and exposure can sometimes lead to skin rashes, eye irritation, and sinus infections.

Purple Mold

Purple is not a common color for mold to be, but if you do see it, it’s probably a color variant of toxic black mold—Stachybotrys chartarum.

White Mold

White is another common color for mold growing in the home and it can be one of a few different types.

• Alternaria: There’s a good chance that any white mold found in your home is Alternaria. This is one example where one mold can change color depending on conditions.
• Chaetomium: A mold that can thrive anywhere—it’s adaptable and resilient. It can grow on many hosts regardless of what they’re made of, but it prefers damp, dark locations. Some might describe it as cotton-like in appearance, and others may write it off as salt deposits on basement walls. One of the distinguishing characteristics of Chaetomium is its scent; it is often the culprit of the musty odor that you may smell in basements, attics, and on foods.
• Penicillium: Another multi-color fungus that can sometimes be white. The discovery of the Penicillium genus served as a monumental step in the medical field as it led to the creation of Penicillin. It can be found on food and walls in homes with high humidity and while it is an important ingredient in Penicillin, it can cause serious allergic reactions if improperly handled.

Blue Mold

Blue is another common color to see in Penicillium molds found on food and walls.

Pink Mold

You might find a discolored, pink film on your shower curtain or bathtub if they have gone unwashed for a while—this is known as “pink mold.” Calling it a mold, though, is a misnomer because it’s actually a bacterium called Serratia marcescens that thrives on soap residues. There’s no permanent solution except to clean your bathroom more regularly, but while it can cause urinary tract infections and respiratory problems, luckily it’s not easy to get infected.

Yellow Mold

Yellow is a color to look out for because some of these molds can be dangerous if left unchecked.

• Aspergillus: Sometimes Aspergillus mold can appear yellow. As mentioned before, in the black mold section, it’s a very common type of mold found in houses and is largely low-risk.
• Serpula lacrymans: Isn’t dangerous for humans as much as it is for the structural integrity of wooden structures. This fungus is an excellent destroyer of damp and rotting organic material, which can spell disaster for your house if not removed. It grows quickly and consumes indoor and outdoor wooden surfaces with ease if the conditions are ideal.
• Epicoccum nigrum: A fast-growing, yellow mold that can be found in or on damp drywall, mattresses, wood, carpets, and furniture. It ranges in color from yellow to orange to brown depending on conditions and surroundings.
• Geomyces pannorum: A more unique fungus than the others on this list—it only grows in cooler conditions. This means that it is largely relegated to damp walls, floors, wood, and paper in northern hemisphere climates.
• Yellow Slime Mold: If you come across a slimy, bright yellow mold in your home, stay very far away from it. Don’t touch it or inhale it as best you can. Bright yellow molds are usually not true molds, rather they’re an unrelated organism called a “slime mold.” Slime molds can be very toxic and exposure should not be taken lightly. None of the other yellow molds in this list are bright yellow—they’re more of a whitish or brownish-yellow—so a orange slime mold should be easy to distinguish.

Red Mold

You may spot red mold on building materials such as particleboards or drywall that have been subjected to water damage. Red is usually not a consistent color for mold to be, and it usually will change colors over time. Many species of mold can become red at some point during their lives, but it’s most likely Aspergillus due to its prevalence. If you find red mold on food, however, that is probably Neurospora.

Orange Mold

Orange mold is similar to Serpula lacrymans in that it is a fast-growing mold that can cause serious damage to wooden structures over time. It’s often found on wooden surfaces inside or outside the home like tables, chairs, beams, and floors. Exposure to orange mold may aggravate asthma and other respiratory conditions, but it usually poses little to no health risk.

Brown Mold

Brown is another color that may be present in several different mold colonies. Many brown molds can spread quickly on harder surfaces, and while they may cause allergies in some, they’re largely safer to be around. Many of these molds have a very musty scent to them. Brown mold can be any of the following types:

• Pithomyces chartarum
• Aureobasidium pullulans
• Stemonitis
• Taeoniella
• Cladosporium
• Mucor: Mucor is the exception to the rule when it comes to brown molds being generally safe to be around. Mucor is a mold type that is very dangerous to be around and can sometimes cause a life-threatening blood infection called mucormycosis. This is one variety of mold that is hard to distinguish because at any point during its life cycle it can be brown, yellow, black, white, or gray.

Mold Testing and Inspection

While identifying mold by color can provide initial clues, professional testing is essential for accurate identification. Mold testing involves collecting samples and analyzing them in a laboratory to determine the exact species and potential health risks. If you suspect mold growth in your home, it’s crucial to get professional mold inspection .

Identifying mold by color can be a helpful first step in understanding the type of mold present in your environment. However, professional testing is crucial for accurate identification and effective remediation. By understanding the different colors and characteristics of mold, you can take proactive steps to maintain a healthy living or working environment.

If you suspect mold in your home, don’t wait—contact Ultimate Mold Crew for professional mold removal services in Toronto today!

Mold Color FAQs

What is the most dangerous type of mold?

The most dangerous type of mold is often considered to be Stachybotrys chartarum, commonly known as “toxic black mold,” due to its ability to produce mycotoxins that can cause serious health issues.

How can I prevent mold growth in my home?

You can prevent mold growth by controlling moisture levels, using dehumidifiers in damp areas, and ensuring proper ventilation. Regular cleaning and maintenance also help in preventing mold.

What should I do if I find mold in my home?

If you find mold in your home, it’s important to identify the type and extent of the mold. For small areas, you can clean it using appropriate solutions. For larger or more severe cases, consult a professional for remediation.

Can all types of mold be harmful?

While not all types of mold are equally harmful, many can cause allergic reactions, respiratory issues, and other health problems. It’s important to address any mold growth promptly.

How do I know if I need professional mold testing?

If you suspect mold growth but are unsure of the type or extent, or if you have health concerns, it’s advisable to get professional mold testing. This ensures accurate identification and appropriate remediation steps.

References:

• Centers for Disease Control and Prevention (CDC). (2021). Stachybotrys chartarum (Stachybotrys atra) ‘Black Mold’.
• Environmental Protection Agency (EPA). (2020). Cladosporium.
• Environmental Protection Agency (EPA). (2020). Aspergillus.
• Environmental Protection Agency (EPA). (2020). Penicillium.
• Environmental Protection Agency (EPA). (2020). Serpula lacrymans.
• Environmental Protection Agency (EPA). (2020). Fusarium.
• Environmental Protection Agency (EPA). (2021). Mold Remediation in Schools and Commercial Buildings.