Yes isn't the internet amazing!
Sorry for not seeing this sooner.I will resend the photos you needed.
The lichen only grows where the air is very pure so that shows it is there.The granite stones faired worse than the sandstone , but I really don' know why; the granite being harder!
The camera wasn't super duper, just a cheap digital Fuji 101X and I got in real close.I also have phtos of graves in Advie cemetery and Cromdale too.I have transcribed the ones I photographed, mostly Mcqueen, Cruickshank, Grant ,Fraser and a few others.
Still stuck with this side of the family.So any help welcome.I have been clutching at straws for months now.