I've noticed a growing green and purple color on my limestone basement wall (see included pictures) - does anyone know if this is some sort of mold? It's very fluorescent in color. Also, I sprayed a few spots with some commercial biocide that a mold remediation company sold me. I sprayed it several times over a two week period, but it never left and now more of it is starting to show in other areas since it started to rain a great deal this month.
Note: On the second picture, the ignore the red stuff at the bottom of the photo - it's debris from brick and masonary.