a bowl of colourful mushroom soup

Inside the bowl is a liquid which reflects the light in all colours of the rainbow. The colours seem to shimmer and shift whenever the soup is viewed from different angles, and sometimes even when viewed from the same angle! In the soup are a few sliced, pale-brown mushrooms swimming around, glowing faintly and creating swirls of colours.

It is a bowl of colourful mushroom soup.
It weighs about one pound.

You identify a bowl of colourful mushroom soup.
It is unsellable food.
It weighs one pound and five ounces, and it is worth about twenty-eight busc.
Its keywords are food, bowl, mushroom, soup, and colourful.