Colors were created using XnView:

Greyscale => Copper:			R+0		G-64	B-255
Greyscale => Silver:			R+32	G+32	B+32
Greyscale => Gold:				R+0		G-16	B-255
Greyscale => Ancient:			R-9		G-1		B-13						Original Formula:		R-16	G+0		B+0		Hue 76, Then B+4
Greyscale => Mithril:			R+0		G+16	B+32
Greyscale => Adamantite:	R-120 G-128 B-112
Iron => New Adamantium		R-40	G-40	B-16
Flint => Obsidian					R-44	G-48	B-24

Sickness/Blight: Contrast -64

Dry/Wet Farmland => Fertilized: 	BR-8	CON-16	R-28	G-16	B-16

