When I first tried it, I wasn’t expecting Navajo plying to produce a completely different yarn from regular plying, but it does.  I tried it on my drop spindle, using multi-coloured singles (where I had spun a little purple for a while, and then switched to a little blue, and then green, and so on).

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When I plyed these singles in the normal way, I got a barber-pole effect across the whole yarn like this:

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But, when I Navajo plyed it, the yarn came out multi-coloured in sections, like these two:

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Both from the same singles, but what a difference!

It’s logical, of course.  In regular plying, you are bringing two separate singles together and, if they are different colours at the point where they ply together, then that barber-pole striping effect is what happens.  Whereas in Navajo plying, you are taking one single and doubling it over on itself (well, tripling it over, actually) so, in a multi-coloured single like I was using, you are plying like with like for a while, then switching to another colour and plying a new like with like, and so on.

I find the difference really intriguing, and I can’t decide which result I like better.  Which do you like more?