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.
Article ID: 1170
Created: February 5, 2026
Last Updated: February 5, 2026
Author: Dev
Online URL: https://surfacecarepros.com/kb/article/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-1170.html