These new (man made) fibers may be the ultimate in recycling.  These fibers are made
by extruding (like making cotton candy) materials (often waste products from food
processes).  They have unique textures, and being protein fibers, take acid dyes well.
Soy silk is made by extruding
the leftovers from the
manufacturing of tofu.  The
press on soy silk is that it
spins like tussah silk, but I
would say it is closer to
bombyx, but it really has its
own texture and is easier to
spin than bombyx.  I have not
heard anyone say anything bad
about soy silk.  It has a
wonderful hand and is really
pretty.  This is my
recommendation for anyone
wanting to try these new
extruded fibers.
It is difficult to describe the texture of bamboo.  
It has a stiffness and a softness.  I really like
spinning bamboo, but not everyone does.  
Bamboo takes dye really well and you can get
highly saturated colors with bamboo.
This blend is truly lovely.  The bombyx silk
adds a glow to the bamboo and takes away some
of the stiffness.  The bamboo enhances the dye
saturation.  If you don't like bamboo by itself,
try this blend.
Just like I have never heard anything bad about
soy silk, I have never heard anything good
about ingeo.  This fiber, made from corn is
deceptively pretty, but it spits out all the twist
that is put into it and is difficult to work with.

I do not recommend ingeo for any purpose.
I was pleasantly surprised when I
first spun silk latte, made from
milk protein.  Based on another
spinner's opinion, I was expecting
to have the same opinion of it as
of ingeo.  It behaves very
differently from other spinning
fibers, as it absorbs most of the
twist put into it.  It makes a very
soft yarn with its own unique
texture.  I really like silk latte, but
not everyone does, so try a small
sample before you commit to a
project.
Extruded Fibers