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Unless otherwise stated, this image is the copyright of the submitter. Contact them for permission to reproduce it. |  | | Description | Detail of the top of the stone. |
| Posted Comments: nicoladidsbury
(2010-03-18) | Well captured, the carving is not easy to see under all that lichen! A very hairy stone ;) | pab
(2010-03-18) | Anyone know if lichen like this is protective of the detail or destructive? I know we should celebrate the lichen as indicating the air is getting purer, but wondered if it has the same sort of damaging effect as ivy on walls? | Andy B
(2010-03-18) | To turn this question round, if it was damaging, how would you stop the lichen growing and keep it off? I do know scraping it off is very damaging. | pab
(2010-03-19) | I was just struck by how different this photo was compared to theCaptains of 1980 on this site page, and wondered if this was the downside of purer air as far as megalithics were concerned!
As for prevention of such growth, I'm sure I've seen loads of magic solutions to keeping this sort of vegetation off 'paths, brickwork, walls ' etc - will check Sunday paper supplements for sources! | Martin L
(2010-03-19) | Growth of lichen and/or moss is one of the major threats to carved surfaces. Removing needs special treatment. | Martin L
(2010-03-19) | Certainly it depends on the kind of lichen and the type of bedrock. At rock art panels in Scandinavia for example Ethanol turned out to be very effective. It does not have an immediate effect, but reapplication over a number of years was very successful. Possibly eroding mechanical treatment becomes largely unnecessary. Another advantage is the minor toxicity. | davidmorgan
(2010-03-19) | Whatever they use here certainly keeps the lichen at bay:
http://www.megalithic.co.uk/modules.php?op=modload&name=a312&file=index&do=showpic&pid=40548
I agree, it depends on the rock - a lot of UK limestone erodes easily. | Martin L
(2010-03-19) | Limestone must be more difficult. In Scandinavia we often have granite-type bedrocks, so everything is more easy (for example use of frottage technique for documentation possible) , although the extreme acid rain (pH sometimes less than 3) seriously affected lots of pre-disintegrated (often by growth of lichen/moss/algae) surfaces. |
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