Limestone paving turning back - Help with limestone paving staining

[benney50]

Hi

We have an issue with some limestone paving. They have suddenly started to turn black. The slabs were fine all winter (laid new November last year) and they are close to a silver birch tree but not all slabs (near the tree) have the black staining. We did weed and feed around 6 weeks ago.

Any help would be gratefully appreciated.

Thanks

Patrick

[lutonlagerlout]

this is a new one , most here worry about their limestone fading
have you a picture you can share here Patrick?
cheers LLL

[seanandruby]

Could be Lichen, have you tried cleaning them ???
Bleach is as good as anything. Try a test area first.

[RAPressureWashing]

It could well be Lichen, or even sap/tannin staining from the Birch tree, a photo would be good before you go any further though.

[benney50]

Hi

Thanks for your suggestions Have some pics but can't find a way to upload them from my pc:(

Will try bleach, also thought about investing in this "the patio black spot remover". Any feedback on this product?

Thanks

Patrick

[RAPressureWashing]

Really do need to confirm what the stain is first, which is why I said if you can post a photo before you go any further.
If it is Lichen, then a bleach mix will be fine and I can give the ratios to use it at, but need to see the stain first.

Most post photos via photobucket.

[Tony McC]

Any feedback on this product?

Relatively expensive and not always effective.

[Tom - Westminster Stone]

What colour was the limestone paving to start with? Yellow, Black or Grey/Blue?