This makes sense, because one of the more famous colonies that the Phoenicians established was Carthage, which is modern day Tunis. Since they had already invented creating purple back in Phoenicia (modern day Lebanon), they simply brought over their traditions/skills along.

I have a DVD from 2004 about them, as I did the National Genographic Project DNA test way back before it was popular, but I must admit, the DVD is so-so. I think afterwards, they got more and more data, and were able to track where they travelled to based on artifacts and DNA. Lots of websites about them, but hard to say what is what. I would trust information by Dr. Pierre Zalloua as he uses DNA analysis for his research into the Phoenicians.