I knew my comment would get correct and incorrect replies and cause some debate. I'm sure Mr. Skeuse was referring to late Parkers when he stated that his Repro was colored with the same method as the "originals". Parkers of the Remington era were cyanide colored. I'm sure Mr. Skeuse used the latest Parkers in building prototypes for his project. Del Grego Parkers were also cyanide colored since many were done in the Remington factory.