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 on the wall with a brush and in several weeks you should start seeing growth.

Mold and algae growing formula: 1 can of beer 1 container of yogurt 1 package of yeast add water to desired consistency.