Best way to protect rock art is to leave it alone.
Allemand
Luc
L
Bahn
Paul G
PG
D001106:Archaeology / Q000379:methods* / Q000592:standards; D002119:Calcium Carbonate / Q000032:analysis; D005602:France; D019015:Geologic Sediments / Q000737:chemistry* / Q000382:microbiology*; D006813:Humidity; D010151:Paintings; D013696:Temperature; D013997:Time Factors
D002119:Calcium Carbonate