pansies floral print vintage taffeta fabric, 50s rayon or acetate?

50s vintage taffeta fabric with gorgeous pansy floral print. This is 44" wide, and we have two pieces in this lot, each a little over 2 yards, for a total of 4+ yards of fabric.

This has a nice firm weave with a very fine cord texture - we're not sure if it's acetate, or rayon or rayon blend.