Nancy...I don't think I've had it recommended for shadow trapunto...the only one I made a few years ago had me
use fabric and reg. batting for the fill. "wool" felt is usually 20-30% wool /acrylic and/or rayon. Most is not stable in
my experience. I've used lots in applique work....and use that property to give my things a vintage look. All acrylic
is more stable...not shrinking or running as much...suspect brand has some bearing. Some is stable ..some is not and
how would ya know !? Certainly white would eliminate problems ...with the acrylic..heat has a way of stiffening up things !!
Long story about that one !! All is my humble opinion ....just use carefully......