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Moss and Lichen Growth May Deteriorate the Limestone

Lichens and mosses produce oxalic acid, which can destroy calcium-based stones. Since they are considered plants, they will also attract moisture, which can cause all kinds of problems with the stone, including spalling. They can also cause the stone... Read More

I have an unusual problem. A customer of mine installed a limestone wall on the outside of his property. It is adjacent to and old limestone wall that has a growth of algae, mold and lichens. Can I get the new wall to look like?

In other words how can I grow algae and molds on the new wall? For this question I contacted a bryolgist at a major university. Bryologly is the study of molds and fungus. He gave me the following formula. Prepare the following mixture and paint it... Read More

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