I sneaked home at lunchtime. Here is the flame fabric, pre-devore (sorry for the slightly blurry photos):
The pattern is clearly visible on the reverse side, but from the front side it looks like solid chenille. This is by design; later tonight I’ll burn out the chenille, applying the burnout chemical from the back (so I can see the pattern in the finished cloth, and also so the burnout chemical doesn’t have to penetrate all that fuzz). Fortunately I have a respirator with acid-gas cartridges on hand; those fumes are not good for your lungs!