The yarn is Lana Grossa's Gomitolo Finito, 100% merino, with rougly 570 yards per 200g cake. 

This yarn has long color runs -- some colors last a very long time and some are spaced in shorter spans.  Take a look at the swatch below the main photo to get a better idea of how these most interesting yarns are dyed.  

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This has primarily variations on one basic color family though it ranges between very dark and very light.

The third photo on this page gives you an idea of how it works up. 

Shades to Wine works with variations of rose, with medium tones darkening to mahogany and current and then lightening again to close-to-pink.