Purple discolorations on plaster on brick wall

  • Erstellt am 2019-09-24 08:25:12

eenuep1

2019-09-24 08:25:12
  • #1
Hello,

I am currently renovating my living room - my wife and baby are eagerly waiting for the retreat space - and now I have discovered purple discolorations under an old wooden wall.

The discoloration also appears on a similar wall (very thin plaster on a brick wall) in a barn here on the former farm.

The color seems to be of a more mineral nature, so perhaps an efflorescence?

I am happy to provide more details; unfortunately, the people on site cannot help me.

See photo

I am now wondering if I can safely remove it and then plaster freshly, or if it needs to be treated with V12 or something similar before removal.

I would be very grateful if someone could help me with advice and experience.

Long searching on the internet, both in English and German, was unfortunately fruitless.

 

Michlhausbauaa

2019-09-24 08:27:35
  • #2
Where can this discoloration be found? Only in corners?
 

eenuep1

2019-09-24 08:32:06
  • #3


No, especially in the middle of the wall at 60-100cm height.

Similar in the old barn (outbuilding).
 

eenuep1

2019-09-24 10:28:40
  • #4
I currently do not see the edit button, therefore an addition: the former farmhouse was built around 1890. The discoloration is each on the inside of exterior walls made of natural stone/rubble stone (basalt/granite) and about 48-60 cm thick. On the inside of the exterior walls, however, bricks are installed.
 

11ant

2019-09-24 14:46:47
  • #5
The first thing that comes to mind spontaneously is: "Iodine stains starch blue," i.e. I could imagine that components of [Viehstallluft] reacted with the plaster under airtight conditions and in the dark in a way that is not known from the unboarded [Viehstall]. According to the picture, it concerns spots behind the ventilation in the same way as spots behind the former battens.
 

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