Spectra and Dyneema are white and considered to be "un-colorable". They do not take dyes or other coloring like standard nylon or polyester.
If you get on Cilo Gear's website you'll quickly notice their S/D pack bodies are all white. There's a reason for that.
Having said that, Dan has a special process where he colors his S/D material. Some have referred to it as "painting", but only Dan knows how he does it and he ain't talkin. The down side is the process is not colorfast. Some of the coloring will disappear over time. I've noticed the gray on my pack has lightened a few shades in some areas.
