Normally when you mix red and green you get some shade of brown. However, if you throw blood-red paint and a dehydrated goblin together you get Hemogoblin, an interesting Turboshift known as a Zenishift. This paint appears differently depending on what color it is applied over.
Over white, Hemogoblin shows up as rusty iron like oxidized heme. Over black, it is a very, dark color that any greenskin would be proud to wear. The bottle photo illustrates this change from top (white) to bottom (black).
This is certainly an unusual pairing, begging to be used on something that goes bump in the night.