Does libertarianism have a color?

Yellow, like the DTOM flags?

I don’t think there really is a libertarian flag/color.

Yes, the color is gold.

http://www.vforvoluntary.com/wiki/VoluntaryistSymbolism#Anarcho-capitalist%20flag

According to the quote in your post, wouldn’t it be gold AND black?

Well libertarianism doesn’t necessarily imply gold…maybe anarchism…depends.