After standing in the elements in a cemetery for several years, grave stones start to acquire their own patina due to colors from metals in the rock, lichens and moss. Here are some winter images collected in a recent walk.
Snow adds its own character to the stains caused by other factors.
Trace metals in natural rocks tend to add to the stain to produce spots of yellow and red. I plan to return to some of these sites to watch the change in colors as the seasons progress.