White Mold: Is It Dangerous?

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Mold that appears whiteWhat is white mold? Is white mold dangerous? Some molds may appear white at the early stage of their growth but change color with age (see the mold picture on the left). The reason is, with some molds the color we see is actually the color of the spores. The body of the mold (i.e., the network of filaments) is generally white or colorless. So, a mold may appear white before it produces spores and later appear black or blue after producing the colored spores. However, some molds have characteristic white color (regardless of age) since their spores are not pigmented. As with black mold, white mold is not a specific type of mold since a number of molds may appear white.

White Mold Or Efflorescence?

There are times when efflorescence is mistaken for white mold. Efflorescence is a white salt deposit commonly seen on concrete floors. As the water wicks up from the ground through the concrete it carries with it dissolved salts. When the water evaporates it leaves behind the visible white stuff which many homeowners mistake for mold. White mold picture

How To Distinguish White Mold From Efflorescence

The easiest way to distinguish white mold from efflorescence is to put some of the stuff into a drop of water. If it dissolves, it is not mold. Also, since efflorescence is crystallized salts, it breaks into a very fine powder if squeezed between fingers. If you have a question regarding white mold, please contact us at 905-290-9101.

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Jackson Kung'u
Dr. Jackson Kung’u is a Microbiologist who has specialized in the field of mycology (the study of moulds and yeasts). He is a member of the Mycological Society of America. He graduated from the University of Kent at Canterbury, UK, with a Masters degree in Fungal Technology and a PhD in Microbiology. He has published several research papers in international scientific journals. Jackson has analyzed thousands of mould samples from across Canada. He also regularly teaches a course on how to recognize mould, perform effective sampling and interpret laboratory results. Jackson provides how-to advice on mould and bacteria issues. Get more information about indoor mould and bacteria at http://www.drjacksonkungu.com.
Jackson Kung'u

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Frequently Asked Questions

Are there harmful and non-harmful molds?
Not all the molds are harmful, some are useful to human, and others are pathogenic,…

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