These fibers are made from man made materials.
Ecospun is made from recycled
plastic bottles.  It spins easily
and makes a nice soft yarn.
Flash is made from nylon and is intended
to be a blending fiber to add sparkle to
other fibers.  It spins fairly easily, but
looses its impact somewhat when spun
alone, so I recommend keeping this one as
a blending fiber.  A little of this goes a
long way.  The "Blue Thunder" blend
listed in the fiber index contains a bit of
flash that can be seen in the photograph.
Synthetics