Marginal gains?
It’s the most disheartening task ever. Even after 10 mins with a wire brush on the same stone the difference is so minimal. Blurgh
Sorry to tell you, but this almost definitely won't work.
You need a sand blaster.
Also be prepared for the inside where a fire sits to still be black after being sand blasted.
@hugo7 started
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Marginal gains?
It’s the most disheartening task ever. Even after 10 mins with a wire brush on the same stone the difference is so minimal. Blurgh