Oblique lighting will certainly help.
IR is reflected strongly by leaves so is unlikely to help with lichen.
It may be that UV will help but it is apparently difficult to do with modern setups.
I've got a range of specialist filters on order for work, which MIGHT allow me to do UV photography using an ancient Kodak lens I've got (no coatings, & little glass), or with a pin hole (Exceedingly long exposures). If either approach works I'll see if I can try it for seeing through lichen.
When do the graves need to be moved?
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Mike
Pentax K5ii & Panasonic G5 user (with far too many bits to list)
Member of North Essex Photographic Workshop
Also online with PentaxUser.co.uk, Flickr, MU-43, MFLenses...
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