This is the result of my first attempts at spinning from the fold. The top was merino (from Wingham Woolwork, a UK supplier) which had it's colours arranged vertically. The colours included blues and teals, pink, burgundy and a pale green. I don't think the colours show up too well in the picture. I'm trying out new settings on my camera.
The colours IRL remind me of a Monet painting:

I found that spinning from the fold did help to retain colour separation. I did end up with small clumps left in my palm after spinning each length. I then spun that clump but the colours were more mixed.
I Navajo plied the singles, again to keep the colours separate.
I thought that spinning from the fold would be a very slow method but it wnet surprisingly quickly. It's still not as fast as spinning from the end of the top though.
Emma