How do I make black limestone hearth grey?

[Qwerty]

Water beads so this is most likely sealed. It will need stripping off as previously stated

 

[Dan]

A good wash with soap to get the oils off could be a free first test.

 

[Dan]

Can i also say i think it looks lovely jet black with the burner on it, total contrast to the walls. Stands out lovely IMO. Give it a week as it is and see if you end up liking it?

 

[Lisa]

Just an update. They came and replaced it with one that's not sealed

 

[Sean Kelly]

I think Lisa was right. It looks lovely. Well done. I bet you can't wait till Winter !!!!

 

[Qwerty]

Thanks for taking the time to share the update with us @Lisa , glad you're happy with it.