Wow!! I can definitely see why this would be your favorite! It is beautiful. I love to see stuff like this that is more like artwork. You could frame it!
It is essentially an iridescent mica spray, in a fine spray bottle. You add the water, so it really cuts down on the price of shipping. The coppers and bronze ones are my favorites.
And she sells dichromatic embossing powders that are gorgeous.
They are also sold on other sites, like addictedrubberstamps.com