Does anyone know what this is??

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I striped my wall back to plaster a year ago and painted it black interior paint and I've seen white marks starting to show don't think it mold what to yous think?

Cheers
 

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Mr Mogey, good evening.

See it is your first post in here? if no one else does Welcome.

The marks appear to be a dampness issue?

Could be two things, one is Condensation occurring internally, or could be penetrating Damp where water is driving through the external wall, problem can be a break down of the DPM around the lintel.

A couple of questions that will assist in possible answers.
1/. What state is the Lintel in externally? is it cracked?
2/. If there is external render or pebble dash is there any cracking in it around / above the Window?
3/. What age is the property?
4/ What state is the Mastic around the window in?
5/. Any possibility of an external photo of the area above the window?

Sorry to ask all these questions, it is simply what i would do if I an working in a property to try to identify source / cause / remedy.

Ken
 
Thanks for the reply I think I know what it is now I have an aquarium in the room and it's always real warm with the lighting system could be really bad condensation internal my house is old and the walls are ok outside its pebble-dash
 
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