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Will a silicone impregnator turn a limestone floor dark?

All silicon based impregnators should be tested first in an inconspicuous area. We have found that certain limestones and an occasional granite will become permanently dark. Apply the impregnator and wait at least 24 hours before making a... 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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