... That lipsticks contain fish scales?
Fish scales are used in lipsticks to give that shimmery look. It is called 'pearlescence'. It is the silvery stuff found in fish scales which are grounded and then added to lipsticks.
There are lipsticks that are made without fish scales. Some use synthetic ingredients to replace the fish scales.
For more information about pearlescence, click on LINK. This is an interesting read.