Anybody got an urgent solution

[One Day]

Well I don't know then! He's basically bleached the dark pigments away.

I would call Bob at lithofin. He's the total expert in this.

 

[WetSaw]

Trust me on this, there's no better product for this one. I can't say how I know, but I know!
(this product has been tested by rather miffed sealant companies who are going to copy it)

Looking at the videos and how it restores acid marked stone it does look good.

 

[Time's Ran Out]

Whatever he uses do a test area first.
Not like he has already done with the brick acid!!

 

[Huddersfield Tiling]

Limestone is alkali. Acid will dissolve it and the grout.
Call Lithofin

 

[One Day]

Limestone is actually pH neutral dissolved in water, but it is an alkaline agent.
The acid used had released /created calcium salts.

(that's technical for "he gone done goofed")

 

[Huddersfield Tiling]

Limestone is mainly composed of Calcium Carbonate which has a pH of nearly 10 which makes it towards the high end of alkaline (14 being the maximum). Even weak acid solutions will cause a dissolving action, and even something like cola which is acidic can dissolve and stain the surface. Without an impregnating sealer, limestone remains vulnerable to any weak acid solutions over time (including acid rain in areas of high pollution).

 

[One Day]

I'm not arguing 😵