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What is Mold?

By Deborah Ng
Updated Jun 04, 2024
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A mold is a type of fungus: a plant-like organism that does not use photosynthesis to produce food, but instead obtains it directly from its surroundings. Molds can display themselves in a variety of colors, such as the familiar green covering often seen on bread or fruit, but this is due only to the reproductive part of the organism — the fungal equivalent of flowers and fruit. The main part of the fungus consists of a network of thin, transparent filaments known as hyphae, which is much less visible.

These fungi can grow on a variety of materials, including soil, decaying plant parts, food, fabrics, and damp walls. They reproduce by releasing huge numbers of tiny spores, which are very tough, and can withstand drying and freezing. Although mold can be a nuisance, and occasionally a health hazard, they can also be useful; they are essential for the breakdown of dead organic matter in the natural environment, they are a valuable source of antibiotics and drugs, and are employed in the production of some foods.

In the Home

Humans have lived with molds for millennia, but in a modern domestic setting, they can cause problems. The black type that forms on damp surfaces such as bathroom walls is unsightly, and may cause damage to the structure. When large quantities of spores become airborne, they can cause a variety of unpleasant symptoms. Some people are allergic to these fungi, and may experience coughing and sneezing, eye irritation, and skin rash. People with asthma, however, may experience more severe problems, such as breathing difficulties.

The spores are constantly present in the atmosphere, and little can be done about them; however, they do not pose any direct threat at the low concentrations normally found in outdoor air. It is when they are produced in large amounts in an enclosed, indoor space that they may have health effects. While spores can survive harsh conditions, the molds themselves require moisture and some degree of warmth to grow. Damp areas in the home are ideal for them, especially if they have poor air circulation and receive limited amounts of natural light, so they are common in bathrooms, basements and attics. When spores land on a damp, indoor surface, they can germinate and form mold that spreads rapidly.

Dealing with Molds

If a homeowner is tackling a mold problem himself, it is in his best interest to invest in some kind of face mask to avoid inhaling particles and spores. A surgical mask, or the type used by carpenters to keep from inhaling saw dust, works well for this task. A long sleeved shirt and long pants should complete the protective outfit.

Mold can be removed by scrubbing the area with warm water and detergent, then allowing it to dry. An additional step of disinfecting the area with a solution of 1 gallon of water (about 3.8 liters) to 1/4 cup (about 60 milliliters) of bleach and then letting it air dry is recommended. This step can be repeated to ensure that most, if not all, of the mold is eliminated. There are also commercial removal products available that are normally sprayed onto the affected area.

To permanently get rid of the problem, however, the source of dampness must be eliminated. The most common reason for dampness is high humidity in places such as bathrooms or sometimes kitchens, and as a result of hanging damp clothes up to dry indoors. Solutions include improving ventilation, dehumidifiers, air conditioning, and drying clothes outdoors, if practical, or using a tumble drier. Other sources of dampness may be leaking roofs, leaking pipes or seepage from wet ground, which may require professional help to fix.


The toxins produced by some species of mold are very effective at killing bacteria, and this discovery led to the development of antibiotics. The first such compound to be discovered was penicillin, in 1928. It revolutionized the treatment of many infectious diseases and since then, a number of other compounds of medical interest have been obtained from these fungi.

Some types are also used in the manufacture of food. They are essential to many types of cheese, such as Camembert and Stilton. The production of soy sauce depends, at an early stage, on the growth of a type of mold on the raw material.

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Discussion Comments
By Mildred12 — On Feb 25, 2017

This is very informative post!

By anon987262 — On Feb 01, 2015

Does mold form on human bones?

By anon355194 — On Nov 14, 2013

When do you know if you should be calling a mold specialist? I have been researching the topic of DIY mold removal, and found an article online about how people can say they are licensed by simply paying 50 dollars for a certificate and buying a book!

Testimonials are also a sure fire way to know if a mold professional is qualified or not. People typically don't gain anything from leaving a review, so you can generally trust a review left by a customer. When I am researching hiring a company, that is where I will usually put most of my stock.

By eidetic — On Nov 16, 2012

@KaBoom - Household mold can be really dangerous. Especially if you have mold allergies! From what I've read, when a home develops a mold problem, usually people with allergies will start feeling bad first.

However, anyone can be affected by mold, especially depending on what kind of mold it is. Some kinds are more toxic than others!

By KaBoom — On Nov 15, 2012

Keeping your house free of mold is really important, because it can make you really, really sick. A good friend of mine had mold in her house, and her whole family was suffering from mold symptoms for months before they figured out what the problem was!

By ceilingcat — On Nov 15, 2012

@strawcake - That's good to know about porous surfaces, and it makes sense. With something like a couch, the mold probably gets inside of it. Whereas if you get mold on a tile wall, the mold is only present on the outside.

One other thing I do to prevent household mold is that I make sure my bathroom is well ventilated. I run the fan after I take a shower every time, so that moisture doesn't sit around the bathroom any longer than it has to!

By strawCake — On Nov 14, 2012

@anon52008 - The article pretty much covered how to get rid of mold. You clean it up, and then get rid of the source for the moisture. If there is too much mold, you can call in a professional!

One other thing I wanted to add though, is that if you get mold on something porous, you have to throw it away. This includes things like couches and curtains.

By anon264405 — On Apr 27, 2012

Which type of food that allows mold to grow faster?

By anon258873 — On Apr 03, 2012

Why does mold grow on milk?

By anon256177 — On Mar 20, 2012

What is a mold spore? I need to know for my science fair project due tomorrow. Help me please.

By anon226682 — On Nov 01, 2011

what use can mold be for?

By anon160116 — On Mar 14, 2011

Is it dangerous? i am doing a project on whose mouth is cleaner a dog's or human's but i am worried because bacteria grows and petri dishes and is it dangerous for me? i am in the sixth grade and eleven and i can't even change my project.

By anon142475 — On Jan 13, 2011

is mold bad to eat? can you die right after eating mold.is mold dangerous. i am doing a project on mold. --lannie

By anon135358 — On Dec 18, 2010

I am dong my science project on this. I have also a question: are bacteria and mold related? I do believe they are. Bacterial cells are single celled and prokaryotic. Thanks for the help. I need to start on my homework as soon as possible (writing and listening to the man who can't be moved at the same time). -Patricia

By anon128521 — On Nov 19, 2010

How does mold grow on plants if they are still alive? maybe you should include if the plant is alive or dead.

By anon128520 — On Nov 19, 2010

Is there a way to see mold spores flying in the air?

By anon118612 — On Oct 14, 2010

This article was helpful but I think there should be more facts. Like whether it is headotropic or not and if it's Eukaryotic or not.

By anon114310 — On Sep 28, 2010

Nice article, All this information is very helpful for me and my science project. i hope i complete my project successfully with this info.

By zevera — On Jul 05, 2010

very informative article. last night i was really worried how to make my assignment on this topic. i have downloaded so much on this topic, but this article helped me a lot. thanks.

By anon79765 — On Apr 24, 2010

Thanks this is very helpful!

By anon79351 — On Apr 22, 2010

this is very helpful. Thank you

By anon78418 — On Apr 18, 2010

this is very helpful.

By anon73139 — On Mar 25, 2010

thanks guys you helped me a lot with my science project. i have to write a 500 word essay on bread and mold so thanks again.

By anon72139 — On Mar 21, 2010

gee thanks. this helped me.

By meme33 — On Feb 22, 2010

For comment 1: worse. Geez. Who doesn't know that!

By anon66915 — On Feb 22, 2010

Why would anyone study mold long enough to gather enough information to create an entire page about it?

This was very helpful for my science fair project.

By anon65006 — On Feb 10, 2010

Mold is the best! i learned a lot from you nerds. it was the best! Thanks guys!

By anon62476 — On Jan 26, 2010

Thank you. this really helped me with my science fair project.

By anon61272 — On Jan 19, 2010

I am doing a project on bread mold and i was wondering how many different types of bread mold there are.

By anon60047 — On Jan 11, 2010

thanks that really helped on my science fair project!

By anon59815 — On Jan 10, 2010

Thanks! i'm in seventh grade and this helped a lot in my "Mold Mania" science fair project. i understand a lot better now.

By anon59282 — On Jan 07, 2010

i am in the fourth grade and I'm doing a science project. if you can post please answer: What is the best condition for the growth of mold? Thank you so much!

By anon54343 — On Nov 29, 2009

i understand now.

By anon54131 — On Nov 27, 2009

It's really a reliable source for my questions.


By anon53177 — On Nov 19, 2009

Does mold grow faster inside or outside of the home?

i am doing a science fair project on mold!

By anon52008 — On Nov 10, 2009

do you have anything else besides these suggestions on how to get rid of mold?

By anon51163 — On Nov 03, 2009

Thanks wise guy so much for this information. i guess you already heard this, but i'm in the sixth grade and i am doing a science project and your information really helped.

By anon51108 — On Nov 03, 2009

the warmth makes it worse because that is how it is made.

By anon51072 — On Nov 03, 2009

Can't you guys spell mold?

By anon50847 — On Nov 01, 2009

This is awesome. im in seventh grade and you just did my science project.

By anon49227 — On Oct 18, 2009

This was great! But I'm in year 9, and you just helped me with a difficult second paragraph in my intro for a stupid assignment! Thank you.

By anon48781 — On Oct 15, 2009

thanks guys; you did my homework. Awesome!

By anon48749 — On Oct 14, 2009

there is so much info. you guys just did my homework!

By anon29212 — On Mar 29, 2009

there is so much info on this article i am in 6th grade its awesome!!!

By anon27281 — On Feb 26, 2009

I am working on a project for school and I am in 6th grade. I was wondering if this site had a mold glossary on different types of molds such as: toxigenic, pathogenic, etc. I was unable to find this information however, the What Is Mold article was very helpful. If you can please post any answers you may have on the what is Mold article on Friday or Saturday, February, 27 or 28! If you do not, thankyou anyway.!!!

get back to me ASAP,

Anonymous (:

By anon4715 — On Oct 29, 2007

Does a warmer area surrounding food prevent mold better or worse?

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