thanks Roanoa, glad it was of help to you.
Rhino horn is fascinating. To me & others who have seen the crop the reaction is always that its green or in some light, grey green with light flecks in the grain.
the 5th rhino type is the Sumatran, it has 2 horns but those left today the horn is only vistigal. I guess allthoughts with larger horns have been hunted out over the years so have been removed from the breeding stock.
take care ,
spiral