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Black mould sash windows.
Mold can also form on exterior window stools the outside sills from high outdoor humidity levels.
Frequent dampness can cause black mildew.
If water is leaking from the outside onto the window sill then it s likely that the window frame is damaged and needs repairing or replacing altogether.
Wood around windows even the interior easily gets damp due to insufficient caulking heavy humidity and rain or condensation that forms naturally on glass.
Typically the mold is colored and able to be seen but sometimes the mold can be the same color as the window frame making it very difficult to see.
Mold inside the wall will be black and webbish looking.
A small amount of discoloration on your windows may be unattractive but is.
How to prevent black mold on windows the type of product that will work for you will also depend on the material the black mold mould is growing on and the environment.
Green mold is fairly common in households and is easier to remove than black mold which is less common but can be hazardous to your family s health and needs to be removed by a professional.
Anything that the mold has settled and grown on will have to be replaced.
And if the window reveals are redecorated you may consider mixing in some anti fungicide solution in with the paint before it is applied to the walls to prevent future mould growth.
If the area is humid and condensation is often found on the window frames or sills this can lead to mould.
In my opinion and previous experience going through a horrible mold situation you really must replace the wood and check to see if the mold had grown in the dark damp space between the walls.