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Family History Beginners Board / Re: Headstone cleaning
« on: Tuesday 07 July 20 10:06 BST (UK) »Is the black mark in the marble not water damage ? I don’t think much can be done about that.
Black staining on carboniferous stone used to be cleaned with a weak acidic solution (somewhat stronger than rainwater) until they realised that it was etching away the surface. Nowadays, it’s removed by spraying it with plain water for an extended period.
Thank you RayT