Still playing with the 2-colours single-shuttle split ring (SSSR), and here is another picture which shows the idea better than the previous one.
Some have asked how I did the SSSR and I will explain it here briefly. You'll need to know the basic of making a SSSR to follow my explanation.
You'll need two shuttle, each with a different colour thread, of course. Loop the thread from one shuttle round the fingers for the ring. When making the double-stitches in the first half of the split ring, you hold both shuttles together. The double stitch will be in the colour of the thread around the fingers made over the two threads as the core thread for the ring.
When the number of double stitches for one half of the ring is done, drop both shuttles and continue with making the second half of the ring with the same colour thread as the first half using the loop method of making the SSSR. Loop the thread of the other colour round the fingers for the next ring to alternate the colour of the rings.
I usually move my shuttle in a sliding method, i.e. sliding the shuttle over/under the core thread. But with two shuttles, I find it easier to use the reverse Reigo method as described in The Complete Book of Tatting by Rebecca Jones.
In my previous post, Martha Ess left a comment that she had taught this technique of 2-colour SSSR at Palmetto during one of the years. I don't know how Martha did hers, but I would think that it is not much different from how I did mine.
Gunhild, in her blog, expanded on this method and added thrown rings on one side of the split ring, which I think opens up new ideas. I should not forget the ever so resourceful Jane Eborall who has put together different variations of the SSSR in her techniques site.