There are many causes of discoloration on a concrete surfaces and the solution will vary depending on the cause.
Black spots on concrete wall.
It thrives in areas that are damp shaded and have moderate temperatures.
Dark black or grayish stains on the wall are a sign of mold.
Black mold on concrete in basement.
Mold thrives in the presence of high humidity warmth and organic matter on which it feeds.
Mold might look like black spots or areas that have turned green.
Create a cleaning solution that s one part bleach to four parts water and apply it to the concrete.
If the white substance dissolves easily with water it is likely the latter.
Methos for removing un wanted discoloration or stains from concrete.
Final thoughts if the above stain removal measures don t work contact a professional.
Black mold is a fungi that has a green and black color.
Discoloration issues on new concrete.
For black mold on concrete in a basement start by ventilating the area well.
The other reason why keeping liquid from absorbing into concrete is important is because it puts stress on the concrete leading to cracking.
Also known as strachybotrys atra black mold can grow on just about anything including concrete.
And don t panic concrete stains are a part of life so no one expects it to look flawless forever.
The combination of substances become darker as layers of dirt accumulate on top of the stain.
Stains colors or discoloration on concrete surfaces.
Because you ll be using bleach indoors open a window and escape the fumes when possible.
Some mold is white but can be confused with efflorescence which is a salty film on the concrete.
Concrete discoloration dark spots stripes and blotchy concrete.
Black stains on concrete consist of layers of dirt and oil chemicals ink or other substances.
When removing a black stain from concrete it is important to completely remove the stain s multiple layers to keep new dirt and debris from reattaching to.
Keep the concrete dry to prevent black mold from forming in the first place.
This article provides a catalog of types of stains found on concrete surfaces.