Is it like any of these?
Polka Dot Shower silk change
"This is a Tarbell style colour changing silk, that goes from polka dots to solid black, and a bunch of white dots come off in your hand, so you can toss 'em in the air like confetti! Kids love the effect, even if it means Mom has to do a little vacuuming after the party!"
POLKA-DOT SILK (JUMBO)
"The performer shows a large silk which is a solid plain colour on both sides. He tosses a number of paper spots into the air, and as they flutter down the silk is swirled in the shower of spots. When the silk is now shown on both sides, it is Polka dotted, the paper spots having apparently fused on it.
The effect can be repeated in reverse, where you show the Polka dotted Silk, and as you I shake it, the spots fall off to the floor, leaving the foulard a solid plain colour."