This tombs-day's topic is lichen...the bane of headstones far and wide.
The two photos show above display a variety of colours of lichens, such as grey, orange, and green.
The photo above shows an example of lichens and the markings and stains it can leave behind on headstones.
Lichen (Lai-kn) is a symbiotic life form consisting of fungus and algae. It can appear in a variety of different colours, shapes, sizes, and textures, though it is typically identified by its flowery, crusty shape. Some different colours of lichens that can be found are orange, grey, green, black, brown and yellowy hues.
Lichens can slowly cover a headstone over time, leaving various types of damage in its wake. It can become thick with many layers that can make it difficut or nearly impossible to read the inscription on a headstone. If caught early on, it can be removed somewhat easily, but older cases of lichens may need specialized equipment and cleaners such as 'D2' to restore the stone. One needs to be knowledgeable and very careful during the removal process as the stone can be damaged easily. In more severe instances the headstone's deterioration may be sped up due to the chemical reactions that occur due to the presence of lichens.
Below is a picture of lichen growing on the side of a granite headstone.
Research Credit to:
https://hironsmemorials.com
https://www.mountauburn.org