CIM 859 Marshmallow - the factory label said "Marahmallow." You know what, I'm going to leap to the conclusion that most people are going to read this as Marshmallow and call it that. Marahmallow isn't totally without precedent, it's just really obscure. (At this point, I'm not sure if it's a typo, or what - but the CIM home site isn't listing it yet - so hard to say.)
Anyhoo - it's a really nice white - a little translucent, and seems to me to be a very nice white - white. It's also a little stiffer than the opaque whites - i.e. the Moretti/Effetre White.
Here is the Marshmallow with a wrap of Cranberry-1 (CIM 926-1 Cranberry Unique). Notice the pinkish cast to the white -that is a reflection of the Cranberry in the Marshmallow. (OK, take that phrase out of context to confuse your friends.)
And finally, one of my painted beads, wrapped around a core of Marshmallow. I'm liking this white a lot!