Fire Retardant C199.01 is suitable for most natural fibers. What's more, it's non-toxic, non-hydroscopic, and will not cause a color change in most dyestuffs.
#1 - Soak Fabric in the C199, squeeze out excess
#2 - Spray the fabric with C199, let it dry
Whichever application option is chosen, the fabric still must be tested to see if it will support the flame. If it will not support the flame, the proper concentration of C199 has been achieved.