In article
,
wrote:
yes - I expect brushing it with acid would improve it a lot. Not going
to get rid of the finger marks but would strip the cement off the
stone faces, and greatly improve the appearance and uniformity.

I reckon they mixed the whole lot together rather than putting on a mortar
coat then throwing the pebbles at it.

--
*Yes, I am an agent of Satan, but my duties are largely ceremonial

Dave Plowman London SW
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